Home / 1,278,007.40-1,917,011.10-391,428.20

Finding the Fourth Proportional to 1,278,007.40, 1,917,011.10 and 391,428.20

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Solution

The fourth proportional to 1,278,007.40, 1,917,011.10 and 391,428.20 is: 587,142.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278,007.40 : 1,917,011.10 = 391,428.20 : x
  2. Step 2: Convert to fraction form
    1,278,007.40/1,917,011.10 = 391,428.20/x
  3. Step 3: Cross multiply
    1,278,007.40x = 1,917,011.10 × 391,428.20
  4. Step 4: Simplify right side
    1,278,007.40x = 750,372,204,253.02
  5. Step 5: Solve for x
    x = 750,372,204,253.02/1,278,007.40
  6. Step 6: Final answer
    x = 587,142.30

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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.