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Finding the Fourth Proportional to 98.42, 135.68 and 86.87

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Solution

The fourth proportional to 98.42, 135.68 and 86.87 is: 119.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.42 : 135.68 = 86.87 : x
  2. Step 2: Convert to fraction form
    98.42/135.68 = 86.87/x
  3. Step 3: Cross multiply
    98.42x = 135.68 × 86.87
  4. Step 4: Simplify right side
    98.42x = 11,786.43
  5. Step 5: Solve for x
    x = 11,786.43/98.42
  6. Step 6: Final answer
    x = 119.76

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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.