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Finding the Fourth Proportional to 147.20, 220.88 and 86.32

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Solution

The fourth proportional to 147.20, 220.88 and 86.32 is: 129.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.20 : 220.88 = 86.32 : x
  2. Step 2: Convert to fraction form
    147.20/220.88 = 86.32/x
  3. Step 3: Cross multiply
    147.20x = 220.88 × 86.32
  4. Step 4: Simplify right side
    147.20x = 19,066.36
  5. Step 5: Solve for x
    x = 19,066.36/147.20
  6. Step 6: Final answer
    x = 129.53

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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.