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Finding the Fourth Proportional to 871.54, 1,306.18 and 761.59

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Solution

The fourth proportional to 871.54, 1,306.18 and 761.59 is: 1,141.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.54 : 1,306.18 = 761.59 : x
  2. Step 2: Convert to fraction form
    871.54/1,306.18 = 761.59/x
  3. Step 3: Cross multiply
    871.54x = 1,306.18 × 761.59
  4. Step 4: Simplify right side
    871.54x = 994,773.63
  5. Step 5: Solve for x
    x = 994,773.63/871.54
  6. Step 6: Final answer
    x = 1,141.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.