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Finding the Fourth Proportional to 104.21, 156.33 and 42.52

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Solution

The fourth proportional to 104.21, 156.33 and 42.52 is: 63.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.21 : 156.33 = 42.52 : x
  2. Step 2: Convert to fraction form
    104.21/156.33 = 42.52/x
  3. Step 3: Cross multiply
    104.21x = 156.33 × 42.52
  4. Step 4: Simplify right side
    104.21x = 6,646.61
  5. Step 5: Solve for x
    x = 6,646.61/104.21
  6. Step 6: Final answer
    x = 63.78

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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.