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Finding the Fourth Proportional to 112.50, 168.78 and 48.36

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Solution

The fourth proportional to 112.50, 168.78 and 48.36 is: 72.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.50 : 168.78 = 48.36 : x
  2. Step 2: Convert to fraction form
    112.50/168.78 = 48.36/x
  3. Step 3: Cross multiply
    112.50x = 168.78 × 48.36
  4. Step 4: Simplify right side
    112.50x = 8,162.20
  5. Step 5: Solve for x
    x = 8,162.20/112.50
  6. Step 6: Final answer
    x = 72.55

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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.