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Finding the Fourth Proportional to 99.08, 136.76 and 77.28

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Solution

The fourth proportional to 99.08, 136.76 and 77.28 is: 106.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.08 : 136.76 = 77.28 : x
  2. Step 2: Convert to fraction form
    99.08/136.76 = 77.28/x
  3. Step 3: Cross multiply
    99.08x = 136.76 × 77.28
  4. Step 4: Simplify right side
    99.08x = 10,568.81
  5. Step 5: Solve for x
    x = 10,568.81/99.08
  6. Step 6: Final answer
    x = 106.67

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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.