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Finding the Fourth Proportional to 98.70, 135.85 and 69.54

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Solution

The fourth proportional to 98.70, 135.85 and 69.54 is: 95.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.70 : 135.85 = 69.54 : x
  2. Step 2: Convert to fraction form
    98.70/135.85 = 69.54/x
  3. Step 3: Cross multiply
    98.70x = 135.85 × 69.54
  4. Step 4: Simplify right side
    98.70x = 9,447.01
  5. Step 5: Solve for x
    x = 9,447.01/98.70
  6. Step 6: Final answer
    x = 95.71

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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.