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Finding the Fourth Proportional to 110.76, 153.60 and 99.96

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Solution

The fourth proportional to 110.76, 153.60 and 99.96 is: 138.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.76 : 153.60 = 99.96 : x
  2. Step 2: Convert to fraction form
    110.76/153.60 = 99.96/x
  3. Step 3: Cross multiply
    110.76x = 153.60 × 99.96
  4. Step 4: Simplify right side
    110.76x = 15,353.86
  5. Step 5: Solve for x
    x = 15,353.86/110.76
  6. Step 6: Final answer
    x = 138.62

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.