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Finding the Fourth Proportional to 721,875.29, 996,175.85 and 399,578.48

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Solution

The fourth proportional to 721,875.29, 996,175.85 and 399,578.48 is: 551,411.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,875.29 : 996,175.85 = 399,578.48 : x
  2. Step 2: Convert to fraction form
    721,875.29/996,175.85 = 399,578.48/x
  3. Step 3: Cross multiply
    721,875.29x = 996,175.85 × 399,578.48
  4. Step 4: Simplify right side
    721,875.29x = 398,050,424,976.94
  5. Step 5: Solve for x
    x = 398,050,424,976.94/721,875.29
  6. Step 6: Final answer
    x = 551,411.62

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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.