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Finding the Fourth Proportional to 718,395.47, 991,430.00 and 396,104.57

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Solution

The fourth proportional to 718,395.47, 991,430.00 and 396,104.57 is: 546,648.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,395.47 : 991,430.00 = 396,104.57 : x
  2. Step 2: Convert to fraction form
    718,395.47/991,430.00 = 396,104.57/x
  3. Step 3: Cross multiply
    718,395.47x = 991,430.00 × 396,104.57
  4. Step 4: Simplify right side
    718,395.47x = 392,709,955,569.52
  5. Step 5: Solve for x
    x = 392,709,955,569.52/718,395.47
  6. Step 6: Final answer
    x = 546,648.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.