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Finding the Fourth Proportional to 148.70, 205.22 and 90.47

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Solution

The fourth proportional to 148.70, 205.22 and 90.47 is: 124.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.70 : 205.22 = 90.47 : x
  2. Step 2: Convert to fraction form
    148.70/205.22 = 90.47/x
  3. Step 3: Cross multiply
    148.70x = 205.22 × 90.47
  4. Step 4: Simplify right side
    148.70x = 18,566.25
  5. Step 5: Solve for x
    x = 18,566.25/148.70
  6. Step 6: Final answer
    x = 124.86

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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.