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Finding the Fourth Proportional to 157.44, 236.40 and 129.12

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Solution

The fourth proportional to 157.44, 236.40 and 129.12 is: 193.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.44 : 236.40 = 129.12 : x
  2. Step 2: Convert to fraction form
    157.44/236.40 = 129.12/x
  3. Step 3: Cross multiply
    157.44x = 236.40 × 129.12
  4. Step 4: Simplify right side
    157.44x = 30,523.97
  5. Step 5: Solve for x
    x = 30,523.97/157.44
  6. Step 6: Final answer
    x = 193.88

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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.