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Finding the Fourth Proportional to 721,871.10, 996,190.92 and 399,610.98

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Solution

The fourth proportional to 721,871.10, 996,190.92 and 399,610.98 is: 551,468.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,871.10 : 996,190.92 = 399,610.98 : x
  2. Step 2: Convert to fraction form
    721,871.10/996,190.92 = 399,610.98/x
  3. Step 3: Cross multiply
    721,871.10x = 996,190.92 × 399,610.98
  4. Step 4: Simplify right side
    721,871.10x = 398,088,829,808.30
  5. Step 5: Solve for x
    x = 398,088,829,808.30/721,871.10
  6. Step 6: Final answer
    x = 551,468.02

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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.