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Finding the Fourth Proportional to 112.84, 169.44 and 74.36

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Solution

The fourth proportional to 112.84, 169.44 and 74.36 is: 111.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.84 : 169.44 = 74.36 : x
  2. Step 2: Convert to fraction form
    112.84/169.44 = 74.36/x
  3. Step 3: Cross multiply
    112.84x = 169.44 × 74.36
  4. Step 4: Simplify right side
    112.84x = 12,599.56
  5. Step 5: Solve for x
    x = 12,599.56/112.84
  6. Step 6: Final answer
    x = 111.66

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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.