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Finding the Fourth Proportional to 105.12, 144.96 and 87.84

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Solution

The fourth proportional to 105.12, 144.96 and 87.84 is: 121.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.12 : 144.96 = 87.84 : x
  2. Step 2: Convert to fraction form
    105.12/144.96 = 87.84/x
  3. Step 3: Cross multiply
    105.12x = 144.96 × 87.84
  4. Step 4: Simplify right side
    105.12x = 12,733.29
  5. Step 5: Solve for x
    x = 12,733.29/105.12
  6. Step 6: Final answer
    x = 121.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.