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Finding the Fourth Proportional to 161.20, 240.14 and 148.72

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Solution

The fourth proportional to 161.20, 240.14 and 148.72 is: 221.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.20 : 240.14 = 148.72 : x
  2. Step 2: Convert to fraction form
    161.20/240.14 = 148.72/x
  3. Step 3: Cross multiply
    161.20x = 240.14 × 148.72
  4. Step 4: Simplify right side
    161.20x = 35,713.62
  5. Step 5: Solve for x
    x = 35,713.62/161.20
  6. Step 6: Final answer
    x = 221.55

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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.