Home / 1,278,005.40-1,917,008.10-391,426.20

Finding the Fourth Proportional to 1,278,005.40, 1,917,008.10 and 391,426.20

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Solution

The fourth proportional to 1,278,005.40, 1,917,008.10 and 391,426.20 is: 587,139.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278,005.40 : 1,917,008.10 = 391,426.20 : x
  2. Step 2: Convert to fraction form
    1,278,005.40/1,917,008.10 = 391,426.20/x
  3. Step 3: Cross multiply
    1,278,005.40x = 1,917,008.10 × 391,426.20
  4. Step 4: Simplify right side
    1,278,005.40x = 750,367,195,952.22
  5. Step 5: Solve for x
    x = 750,367,195,952.22/1,278,005.40
  6. Step 6: Final answer
    x = 587,139.30

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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.