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Finding the Fourth Proportional to 148.24, 204.70 and 99.20

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Solution

The fourth proportional to 148.24, 204.70 and 99.20 is: 136.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.24 : 204.70 = 99.20 : x
  2. Step 2: Convert to fraction form
    148.24/204.70 = 99.20/x
  3. Step 3: Cross multiply
    148.24x = 204.70 × 99.20
  4. Step 4: Simplify right side
    148.24x = 20,306.24
  5. Step 5: Solve for x
    x = 20,306.24/148.24
  6. Step 6: Final answer
    x = 136.98

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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.