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Finding the Fourth Proportional to 461.12, 691.85 and 187.18

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Solution

The fourth proportional to 461.12, 691.85 and 187.18 is: 280.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.12 : 691.85 = 187.18 : x
  2. Step 2: Convert to fraction form
    461.12/691.85 = 187.18/x
  3. Step 3: Cross multiply
    461.12x = 691.85 × 187.18
  4. Step 4: Simplify right side
    461.12x = 129,499.22
  5. Step 5: Solve for x
    x = 129,499.22/461.12
  6. Step 6: Final answer
    x = 280.84

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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.