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Finding the Fourth Proportional to 98.92, 136.62 and 86.56

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Solution

The fourth proportional to 98.92, 136.62 and 86.56 is: 119.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.92 : 136.62 = 86.56 : x
  2. Step 2: Convert to fraction form
    98.92/136.62 = 86.56/x
  3. Step 3: Cross multiply
    98.92x = 136.62 × 86.56
  4. Step 4: Simplify right side
    98.92x = 11,825.83
  5. Step 5: Solve for x
    x = 11,825.83/98.92
  6. Step 6: Final answer
    x = 119.55

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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.