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Finding the Fourth Proportional to 147.96, 221.91 and 66.75

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Solution

The fourth proportional to 147.96, 221.91 and 66.75 is: 100.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.96 : 221.91 = 66.75 : x
  2. Step 2: Convert to fraction form
    147.96/221.91 = 66.75/x
  3. Step 3: Cross multiply
    147.96x = 221.91 × 66.75
  4. Step 4: Simplify right side
    147.96x = 14,812.49
  5. Step 5: Solve for x
    x = 14,812.49/147.96
  6. Step 6: Final answer
    x = 100.11

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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.