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Finding the Fourth Proportional to 639,209.80, 958,814.70 and 440,144.20

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Solution

The fourth proportional to 639,209.80, 958,814.70 and 440,144.20 is: 660,216.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,209.80 : 958,814.70 = 440,144.20 : x
  2. Step 2: Convert to fraction form
    639,209.80/958,814.70 = 440,144.20/x
  3. Step 3: Cross multiply
    639,209.80x = 958,814.70 × 440,144.20
  4. Step 4: Simplify right side
    639,209.80x = 422,016,729,079.74
  5. Step 5: Solve for x
    x = 422,016,729,079.74/639,209.80
  6. Step 6: Final answer
    x = 660,216.30

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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.