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Finding the Fourth Proportional to 147.72, 204.21 and 135.42

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Solution

The fourth proportional to 147.72, 204.21 and 135.42 is: 187.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.72 : 204.21 = 135.42 : x
  2. Step 2: Convert to fraction form
    147.72/204.21 = 135.42/x
  3. Step 3: Cross multiply
    147.72x = 204.21 × 135.42
  4. Step 4: Simplify right side
    147.72x = 27,654.12
  5. Step 5: Solve for x
    x = 27,654.12/147.72
  6. Step 6: Final answer
    x = 187.21

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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.