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Finding the Fourth Proportional to 98.38, 146.80 and 85.42

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Solution

The fourth proportional to 98.38, 146.80 and 85.42 is: 127.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.38 : 146.80 = 85.42 : x
  2. Step 2: Convert to fraction form
    98.38/146.80 = 85.42/x
  3. Step 3: Cross multiply
    98.38x = 146.80 × 85.42
  4. Step 4: Simplify right side
    98.38x = 12,538.92
  5. Step 5: Solve for x
    x = 12,538.92/98.38
  6. Step 6: Final answer
    x = 127.46

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.