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Finding the Fourth Proportional to 112.65, 169.07 and 78.56

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Solution

The fourth proportional to 112.65, 169.07 and 78.56 is: 117.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.65 : 169.07 = 78.56 : x
  2. Step 2: Convert to fraction form
    112.65/169.07 = 78.56/x
  3. Step 3: Cross multiply
    112.65x = 169.07 × 78.56
  4. Step 4: Simplify right side
    112.65x = 13,282.14
  5. Step 5: Solve for x
    x = 13,282.14/112.65
  6. Step 6: Final answer
    x = 117.91

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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.