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Finding the Fourth Proportional to 147.28, 220.40 and 108.72

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Solution

The fourth proportional to 147.28, 220.40 and 108.72 is: 162.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.28 : 220.40 = 108.72 : x
  2. Step 2: Convert to fraction form
    147.28/220.40 = 108.72/x
  3. Step 3: Cross multiply
    147.28x = 220.40 × 108.72
  4. Step 4: Simplify right side
    147.28x = 23,961.89
  5. Step 5: Solve for x
    x = 23,961.89/147.28
  6. Step 6: Final answer
    x = 162.70

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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.