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Finding the Fourth Proportional to 112.60, 168.68 and 72.08

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Solution

The fourth proportional to 112.60, 168.68 and 72.08 is: 107.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.60 : 168.68 = 72.08 : x
  2. Step 2: Convert to fraction form
    112.60/168.68 = 72.08/x
  3. Step 3: Cross multiply
    112.60x = 168.68 × 72.08
  4. Step 4: Simplify right side
    112.60x = 12,158.45
  5. Step 5: Solve for x
    x = 12,158.45/112.60
  6. Step 6: Final answer
    x = 107.98

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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.