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Finding the Fourth Proportional to 147.25, 220.81 and 66.15

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Solution

The fourth proportional to 147.25, 220.81 and 66.15 is: 99.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.25 : 220.81 = 66.15 : x
  2. Step 2: Convert to fraction form
    147.25/220.81 = 66.15/x
  3. Step 3: Cross multiply
    147.25x = 220.81 × 66.15
  4. Step 4: Simplify right side
    147.25x = 14,606.58
  5. Step 5: Solve for x
    x = 14,606.58/147.25
  6. Step 6: Final answer
    x = 99.20

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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.