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Finding the Fourth Proportional to 135.72, 187.56 and 128.04

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Solution

The fourth proportional to 135.72, 187.56 and 128.04 is: 176.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.72 : 187.56 = 128.04 : x
  2. Step 2: Convert to fraction form
    135.72/187.56 = 128.04/x
  3. Step 3: Cross multiply
    135.72x = 187.56 × 128.04
  4. Step 4: Simplify right side
    135.72x = 24,015.18
  5. Step 5: Solve for x
    x = 24,015.18/135.72
  6. Step 6: Final answer
    x = 176.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.