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Finding the Fourth Proportional to 147.11, 220.89 and 86.28

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Solution

The fourth proportional to 147.11, 220.89 and 86.28 is: 129.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.11 : 220.89 = 86.28 : x
  2. Step 2: Convert to fraction form
    147.11/220.89 = 86.28/x
  3. Step 3: Cross multiply
    147.11x = 220.89 × 86.28
  4. Step 4: Simplify right side
    147.11x = 19,058.39
  5. Step 5: Solve for x
    x = 19,058.39/147.11
  6. Step 6: Final answer
    x = 129.55

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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.