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Finding the Fourth Proportional to 721,787.22, 996,035.04 and 399,478.10

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Solution

The fourth proportional to 721,787.22, 996,035.04 and 399,478.10 is: 551,262.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,787.22 : 996,035.04 = 399,478.10 : x
  2. Step 2: Convert to fraction form
    721,787.22/996,035.04 = 399,478.10/x
  3. Step 3: Cross multiply
    721,787.22x = 996,035.04 × 399,478.10
  4. Step 4: Simplify right side
    721,787.22x = 397,894,184,067.58
  5. Step 5: Solve for x
    x = 397,894,184,067.58/721,787.22
  6. Step 6: Final answer
    x = 551,262.44

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Double scale
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1.5x scale

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.