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Finding the Fourth Proportional to 158.25, 236.88 and 129.12

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Solution

The fourth proportional to 158.25, 236.88 and 129.12 is: 193.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.25 : 236.88 = 129.12 : x
  2. Step 2: Convert to fraction form
    158.25/236.88 = 129.12/x
  3. Step 3: Cross multiply
    158.25x = 236.88 × 129.12
  4. Step 4: Simplify right side
    158.25x = 30,585.95
  5. Step 5: Solve for x
    x = 30,585.95/158.25
  6. Step 6: Final answer
    x = 193.28

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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.