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Finding the Fourth Proportional to 148.12, 204.45 and 115.42

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Solution

The fourth proportional to 148.12, 204.45 and 115.42 is: 159.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.12 : 204.45 = 115.42 : x
  2. Step 2: Convert to fraction form
    148.12/204.45 = 115.42/x
  3. Step 3: Cross multiply
    148.12x = 204.45 × 115.42
  4. Step 4: Simplify right side
    148.12x = 23,597.62
  5. Step 5: Solve for x
    x = 23,597.62/148.12
  6. Step 6: Final answer
    x = 159.31

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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.