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Finding the Fourth Proportional to 148.69, 221.84 and 129.40

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Solution

The fourth proportional to 148.69, 221.84 and 129.40 is: 193.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.69 : 221.84 = 129.40 : x
  2. Step 2: Convert to fraction form
    148.69/221.84 = 129.40/x
  3. Step 3: Cross multiply
    148.69x = 221.84 × 129.40
  4. Step 4: Simplify right side
    148.69x = 28,705.38
  5. Step 5: Solve for x
    x = 28,705.38/148.69
  6. Step 6: Final answer
    x = 193.06

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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.