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Finding the Fourth Proportional to 148.12, 221.98 and 71

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Solution

The fourth proportional to 148.12, 221.98 and 71 is: 106.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.12 : 221.98 = 71 : x
  2. Step 2: Convert to fraction form
    148.12/221.98 = 71/x
  3. Step 3: Cross multiply
    148.12x = 221.98 × 71
  4. Step 4: Simplify right side
    148.12x = 15,760.58
  5. Step 5: Solve for x
    x = 15,760.58/148.12
  6. Step 6: Final answer
    x = 106.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.