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Finding the Fourth Proportional to 781.32, 1,171.82 and 456.44

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Solution

The fourth proportional to 781.32, 1,171.82 and 456.44 is: 684.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.32 : 1,171.82 = 456.44 : x
  2. Step 2: Convert to fraction form
    781.32/1,171.82 = 456.44/x
  3. Step 3: Cross multiply
    781.32x = 1,171.82 × 456.44
  4. Step 4: Simplify right side
    781.32x = 534,865.52
  5. Step 5: Solve for x
    x = 534,865.52/781.32
  6. Step 6: Final answer
    x = 684.57

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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.