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Finding the Fourth Proportional to 112.88, 169.21 and 61.51

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Solution

The fourth proportional to 112.88, 169.21 and 61.51 is: 92.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.88 : 169.21 = 61.51 : x
  2. Step 2: Convert to fraction form
    112.88/169.21 = 61.51/x
  3. Step 3: Cross multiply
    112.88x = 169.21 × 61.51
  4. Step 4: Simplify right side
    112.88x = 10,407.86
  5. Step 5: Solve for x
    x = 10,407.86/112.88
  6. Step 6: Final answer
    x = 92.20

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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.