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Finding the Fourth Proportional to 98.75, 136.21 and 59.38

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Solution

The fourth proportional to 98.75, 136.21 and 59.38 is: 81.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.75 : 136.21 = 59.38 : x
  2. Step 2: Convert to fraction form
    98.75/136.21 = 59.38/x
  3. Step 3: Cross multiply
    98.75x = 136.21 × 59.38
  4. Step 4: Simplify right side
    98.75x = 8,087.66
  5. Step 5: Solve for x
    x = 8,087.66/98.75
  6. Step 6: Final answer
    x = 81.90

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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.