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Finding the Fourth Proportional to 157.20, 217.01 and 104.85

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Solution

The fourth proportional to 157.20, 217.01 and 104.85 is: 144.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.20 : 217.01 = 104.85 : x
  2. Step 2: Convert to fraction form
    157.20/217.01 = 104.85/x
  3. Step 3: Cross multiply
    157.20x = 217.01 × 104.85
  4. Step 4: Simplify right side
    157.20x = 22,753.50
  5. Step 5: Solve for x
    x = 22,753.50/157.20
  6. Step 6: Final answer
    x = 144.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.