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Finding the Fourth Proportional to 148.12, 221.95 and 87.13

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Solution

The fourth proportional to 148.12, 221.95 and 87.13 is: 130.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.12 : 221.95 = 87.13 : x
  2. Step 2: Convert to fraction form
    148.12/221.95 = 87.13/x
  3. Step 3: Cross multiply
    148.12x = 221.95 × 87.13
  4. Step 4: Simplify right side
    148.12x = 19,338.50
  5. Step 5: Solve for x
    x = 19,338.50/148.12
  6. Step 6: Final answer
    x = 130.56

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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.