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Finding the Fourth Proportional to 718,462.60, 991,485.30 and 396,184.12

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Solution

The fourth proportional to 718,462.60, 991,485.30 and 396,184.12 is: 546,737.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,462.60 : 991,485.30 = 396,184.12 : x
  2. Step 2: Convert to fraction form
    718,462.60/991,485.30 = 396,184.12/x
  3. Step 3: Cross multiply
    718,462.60x = 991,485.30 × 396,184.12
  4. Step 4: Simplify right side
    718,462.60x = 392,810,731,073.44
  5. Step 5: Solve for x
    x = 392,810,731,073.44/718,462.60
  6. Step 6: Final answer
    x = 546,737.90

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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.