Home / 672,085.60-1,008,128.40-639,426.40

Finding the Fourth Proportional to 672,085.60, 1,008,128.40 and 639,426.40

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Solution

The fourth proportional to 672,085.60, 1,008,128.40 and 639,426.40 is: 959,139.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    672,085.60 : 1,008,128.40 = 639,426.40 : x
  2. Step 2: Convert to fraction form
    672,085.60/1,008,128.40 = 639,426.40/x
  3. Step 3: Cross multiply
    672,085.60x = 1,008,128.40 × 639,426.40
  4. Step 4: Simplify right side
    672,085.60x = 644,623,913,549.76
  5. Step 5: Solve for x
    x = 644,623,913,549.76/672,085.60
  6. Step 6: Final answer
    x = 959,139.60

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.