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Finding the Fourth Proportional to 104.61, 156.89 and 31.47

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Solution

The fourth proportional to 104.61, 156.89 and 31.47 is: 47.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.61 : 156.89 = 31.47 : x
  2. Step 2: Convert to fraction form
    104.61/156.89 = 31.47/x
  3. Step 3: Cross multiply
    104.61x = 156.89 × 31.47
  4. Step 4: Simplify right side
    104.61x = 4,937.33
  5. Step 5: Solve for x
    x = 4,937.33/104.61
  6. Step 6: Final answer
    x = 47.20

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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.