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Finding the Fourth Proportional to 136.42, 203.72 and 129.40

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Solution

The fourth proportional to 136.42, 203.72 and 129.40 is: 193.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.42 : 203.72 = 129.40 : x
  2. Step 2: Convert to fraction form
    136.42/203.72 = 129.40/x
  3. Step 3: Cross multiply
    136.42x = 203.72 × 129.40
  4. Step 4: Simplify right side
    136.42x = 26,359.70
  5. Step 5: Solve for x
    x = 26,359.70/136.42
  6. Step 6: Final answer
    x = 193.23

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.