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Finding the Fourth Proportional to 410.40, 615.72 and 136.56

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Solution

The fourth proportional to 410.40, 615.72 and 136.56 is: 204.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    410.40 : 615.72 = 136.56 : x
  2. Step 2: Convert to fraction form
    410.40/615.72 = 136.56/x
  3. Step 3: Cross multiply
    410.40x = 615.72 × 136.56
  4. Step 4: Simplify right side
    410.40x = 84,082.72
  5. Step 5: Solve for x
    x = 84,082.72/410.40
  6. Step 6: Final answer
    x = 204.88

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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.