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Finding the Fourth Proportional to 111.96, 154.20 and 87.48

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Solution

The fourth proportional to 111.96, 154.20 and 87.48 is: 120.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.96 : 154.20 = 87.48 : x
  2. Step 2: Convert to fraction form
    111.96/154.20 = 87.48/x
  3. Step 3: Cross multiply
    111.96x = 154.20 × 87.48
  4. Step 4: Simplify right side
    111.96x = 13,489.42
  5. Step 5: Solve for x
    x = 13,489.42/111.96
  6. Step 6: Final answer
    x = 120.48

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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.