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Finding the Fourth Proportional to 920.60, 1,381.35 and 487.75

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Solution

The fourth proportional to 920.60, 1,381.35 and 487.75 is: 731.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.60 : 1,381.35 = 487.75 : x
  2. Step 2: Convert to fraction form
    920.60/1,381.35 = 487.75/x
  3. Step 3: Cross multiply
    920.60x = 1,381.35 × 487.75
  4. Step 4: Simplify right side
    920.60x = 673,753.46
  5. Step 5: Solve for x
    x = 673,753.46/920.60
  6. Step 6: Final answer
    x = 731.86

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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.