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Finding the Fourth Proportional to 148.39, 221.48 and 129.19

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Solution

The fourth proportional to 148.39, 221.48 and 129.19 is: 192.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.39 : 221.48 = 129.19 : x
  2. Step 2: Convert to fraction form
    148.39/221.48 = 129.19/x
  3. Step 3: Cross multiply
    148.39x = 221.48 × 129.19
  4. Step 4: Simplify right side
    148.39x = 28,613.00
  5. Step 5: Solve for x
    x = 28,613.00/148.39
  6. Step 6: Final answer
    x = 192.82

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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.