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Finding the Fourth Proportional to 721,787.27, 996,051.53 and 399,478.14

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Solution

The fourth proportional to 721,787.27, 996,051.53 and 399,478.14 is: 551,271.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,787.27 : 996,051.53 = 399,478.14 : x
  2. Step 2: Convert to fraction form
    721,787.27/996,051.53 = 399,478.14/x
  3. Step 3: Cross multiply
    721,787.27x = 996,051.53 × 399,478.14
  4. Step 4: Simplify right side
    721,787.27x = 397,900,810,551.16
  5. Step 5: Solve for x
    x = 397,900,810,551.16/721,787.27
  6. Step 6: Final answer
    x = 551,271.59

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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.