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Finding the Fourth Proportional to 721,881.76, 996,198.72 and 399,614.08

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Solution

The fourth proportional to 721,881.76, 996,198.72 and 399,614.08 is: 551,468.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,881.76 : 996,198.72 = 399,614.08 : x
  2. Step 2: Convert to fraction form
    721,881.76/996,198.72 = 399,614.08/x
  3. Step 3: Cross multiply
    721,881.76x = 996,198.72 × 399,614.08
  4. Step 4: Simplify right side
    721,881.76x = 398,095,034,989.98
  5. Step 5: Solve for x
    x = 398,095,034,989.98/721,881.76
  6. Step 6: Final answer
    x = 551,468.48

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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.