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Finding the Fourth Proportional to 148.48, 221.64 and 126.88

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Solution

The fourth proportional to 148.48, 221.64 and 126.88 is: 189.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.48 : 221.64 = 126.88 : x
  2. Step 2: Convert to fraction form
    148.48/221.64 = 126.88/x
  3. Step 3: Cross multiply
    148.48x = 221.64 × 126.88
  4. Step 4: Simplify right side
    148.48x = 28,121.68
  5. Step 5: Solve for x
    x = 28,121.68/148.48
  6. Step 6: Final answer
    x = 189.40

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.