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Finding the Fourth Proportional to 828.38, 1,142.73 and 631.55

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Solution

The fourth proportional to 828.38, 1,142.73 and 631.55 is: 871.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.38 : 1,142.73 = 631.55 : x
  2. Step 2: Convert to fraction form
    828.38/1,142.73 = 631.55/x
  3. Step 3: Cross multiply
    828.38x = 1,142.73 × 631.55
  4. Step 4: Simplify right side
    828.38x = 721,691.13
  5. Step 5: Solve for x
    x = 721,691.13/828.38
  6. Step 6: Final answer
    x = 871.21

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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.