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Finding the Fourth Proportional to 104.28, 156.21 and 99.92

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Solution

The fourth proportional to 104.28, 156.21 and 99.92 is: 149.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.28 : 156.21 = 99.92 : x
  2. Step 2: Convert to fraction form
    104.28/156.21 = 99.92/x
  3. Step 3: Cross multiply
    104.28x = 156.21 × 99.92
  4. Step 4: Simplify right side
    104.28x = 15,608.50
  5. Step 5: Solve for x
    x = 15,608.50/104.28
  6. Step 6: Final answer
    x = 149.69

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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.