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Finding the Fourth Proportional to 828.70, 1,142.41 and 631.87

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Solution

The fourth proportional to 828.70, 1,142.41 and 631.87 is: 871.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.70 : 1,142.41 = 631.87 : x
  2. Step 2: Convert to fraction form
    828.70/1,142.41 = 631.87/x
  3. Step 3: Cross multiply
    828.70x = 1,142.41 × 631.87
  4. Step 4: Simplify right side
    828.70x = 721,854.61
  5. Step 5: Solve for x
    x = 721,854.61/828.70
  6. Step 6: Final answer
    x = 871.07

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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.