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Finding the Fourth Proportional to 98, 134.88 and 87.08

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Solution

The fourth proportional to 98, 134.88 and 87.08 is: 119.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    98 : 134.88 = 87.08 : x
  2. Step 2: Convert to fraction form
    98/134.88 = 87.08/x
  3. Step 3: Cross multiply
    98x = 134.88 × 87.08
  4. Step 4: Simplify right side
    98x = 11,745.35
  5. Step 5: Solve for x
    x = 11,745.35/98
  6. Step 6: Final answer
    x = 119.85

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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.