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Finding the Fourth Proportional to 718,435.17, 991,421.37 and 396,139.68

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Solution

The fourth proportional to 718,435.17, 991,421.37 and 396,139.68 is: 546,662.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,435.17 : 991,421.37 = 396,139.68 : x
  2. Step 2: Convert to fraction form
    718,435.17/991,421.37 = 396,139.68/x
  3. Step 3: Cross multiply
    718,435.17x = 991,421.37 × 396,139.68
  4. Step 4: Simplify right side
    718,435.17x = 392,741,344,256.96
  5. Step 5: Solve for x
    x = 392,741,344,256.96/718,435.17
  6. Step 6: Final answer
    x = 546,662.19

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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.