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Finding the Fourth Proportional to 148.79, 205.31 and 90.56

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Solution

The fourth proportional to 148.79, 205.31 and 90.56 is: 124.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.79 : 205.31 = 90.56 : x
  2. Step 2: Convert to fraction form
    148.79/205.31 = 90.56/x
  3. Step 3: Cross multiply
    148.79x = 205.31 × 90.56
  4. Step 4: Simplify right side
    148.79x = 18,593.61
  5. Step 5: Solve for x
    x = 18,593.61/148.79
  6. Step 6: Final answer
    x = 124.96

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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.