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Finding the Fourth Proportional to 721,872.61, 996,172.09 and 399,575.77

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Solution

The fourth proportional to 721,872.61, 996,172.09 and 399,575.77 is: 551,407.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,872.61 : 996,172.09 = 399,575.77 : x
  2. Step 2: Convert to fraction form
    721,872.61/996,172.09 = 399,575.77/x
  3. Step 3: Cross multiply
    721,872.61x = 996,172.09 × 399,575.77
  4. Step 4: Simplify right side
    721,872.61x = 398,046,226,424.89
  5. Step 5: Solve for x
    x = 398,046,226,424.89/721,872.61
  6. Step 6: Final answer
    x = 551,407.86

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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.