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Finding the Fourth Proportional to 147.12, 220.49 and 65.87

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Solution

The fourth proportional to 147.12, 220.49 and 65.87 is: 98.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.12 : 220.49 = 65.87 : x
  2. Step 2: Convert to fraction form
    147.12/220.49 = 65.87/x
  3. Step 3: Cross multiply
    147.12x = 220.49 × 65.87
  4. Step 4: Simplify right side
    147.12x = 14,523.68
  5. Step 5: Solve for x
    x = 14,523.68/147.12
  6. Step 6: Final answer
    x = 98.72

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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.