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Finding the Fourth Proportional to 112.74, 169.04 and 78.47

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Solution

The fourth proportional to 112.74, 169.04 and 78.47 is: 117.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.74 : 169.04 = 78.47 : x
  2. Step 2: Convert to fraction form
    112.74/169.04 = 78.47/x
  3. Step 3: Cross multiply
    112.74x = 169.04 × 78.47
  4. Step 4: Simplify right side
    112.74x = 13,263.33
  5. Step 5: Solve for x
    x = 13,263.33/112.74
  6. Step 6: Final answer
    x = 117.65

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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.