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Finding the Fourth Proportional to 147.72, 221.20 and 104.15

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Solution

The fourth proportional to 147.72, 221.20 and 104.15 is: 155.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.72 : 221.20 = 104.15 : x
  2. Step 2: Convert to fraction form
    147.72/221.20 = 104.15/x
  3. Step 3: Cross multiply
    147.72x = 221.20 × 104.15
  4. Step 4: Simplify right side
    147.72x = 23,038.94
  5. Step 5: Solve for x
    x = 23,038.94/147.72
  6. Step 6: Final answer
    x = 155.96

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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.