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Finding the Fourth Proportional to 148.72, 205.16 and 99.56

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Solution

The fourth proportional to 148.72, 205.16 and 99.56 is: 137.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.72 : 205.16 = 99.56 : x
  2. Step 2: Convert to fraction form
    148.72/205.16 = 99.56/x
  3. Step 3: Cross multiply
    148.72x = 205.16 × 99.56
  4. Step 4: Simplify right side
    148.72x = 20,425.73
  5. Step 5: Solve for x
    x = 20,425.73/148.72
  6. Step 6: Final answer
    x = 137.34

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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.