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Finding the Fourth Proportional to 148.80, 221.91 and 145.92

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Solution

The fourth proportional to 148.80, 221.91 and 145.92 is: 217.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.80 : 221.91 = 145.92 : x
  2. Step 2: Convert to fraction form
    148.80/221.91 = 145.92/x
  3. Step 3: Cross multiply
    148.80x = 221.91 × 145.92
  4. Step 4: Simplify right side
    148.80x = 32,381.11
  5. Step 5: Solve for x
    x = 32,381.11/148.80
  6. Step 6: Final answer
    x = 217.61

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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.