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Finding the Fourth Proportional to 721,882.64, 996,185.94 and 399,585.80

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Solution

The fourth proportional to 721,882.64, 996,185.94 and 399,585.80 is: 551,421.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,882.64 : 996,185.94 = 399,585.80 : x
  2. Step 2: Convert to fraction form
    721,882.64/996,185.94 = 399,585.80/x
  3. Step 3: Cross multiply
    721,882.64x = 996,185.94 × 399,585.80
  4. Step 4: Simplify right side
    721,882.64x = 398,061,750,802.72
  5. Step 5: Solve for x
    x = 398,061,750,802.72/721,882.64
  6. Step 6: Final answer
    x = 551,421.70

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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.