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Finding the Fourth Proportional to 112.88, 169.32 and 31.72

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Solution

The fourth proportional to 112.88, 169.32 and 31.72 is: 47.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.88 : 169.32 = 31.72 : x
  2. Step 2: Convert to fraction form
    112.88/169.32 = 31.72/x
  3. Step 3: Cross multiply
    112.88x = 169.32 × 31.72
  4. Step 4: Simplify right side
    112.88x = 5,370.67
  5. Step 5: Solve for x
    x = 5,370.67/112.88
  6. Step 6: Final answer
    x = 47.58

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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.