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Finding the Fourth Proportional to 112.17, 168.39 and 71.67

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Solution

The fourth proportional to 112.17, 168.39 and 71.67 is: 107.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.17 : 168.39 = 71.67 : x
  2. Step 2: Convert to fraction form
    112.17/168.39 = 71.67/x
  3. Step 3: Cross multiply
    112.17x = 168.39 × 71.67
  4. Step 4: Simplify right side
    112.17x = 12,068.51
  5. Step 5: Solve for x
    x = 12,068.51/112.17
  6. Step 6: Final answer
    x = 107.59

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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.