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Finding the Fourth Proportional to 148.32, 221.32 and 139.12

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Solution

The fourth proportional to 148.32, 221.32 and 139.12 is: 207.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.32 : 221.32 = 139.12 : x
  2. Step 2: Convert to fraction form
    148.32/221.32 = 139.12/x
  3. Step 3: Cross multiply
    148.32x = 221.32 × 139.12
  4. Step 4: Simplify right side
    148.32x = 30,790.04
  5. Step 5: Solve for x
    x = 30,790.04/148.32
  6. Step 6: Final answer
    x = 207.59

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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.