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Finding the Fourth Proportional to 461.12, 691.56 and 136.40

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Solution

The fourth proportional to 461.12, 691.56 and 136.40 is: 204.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.12 : 691.56 = 136.40 : x
  2. Step 2: Convert to fraction form
    461.12/691.56 = 136.40/x
  3. Step 3: Cross multiply
    461.12x = 691.56 × 136.40
  4. Step 4: Simplify right side
    461.12x = 94,328.78
  5. Step 5: Solve for x
    x = 94,328.78/461.12
  6. Step 6: Final answer
    x = 204.56

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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.