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Finding the Fourth Proportional to 98.70, 148.79 and 92.09

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Solution

The fourth proportional to 98.70, 148.79 and 92.09 is: 138.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.70 : 148.79 = 92.09 : x
  2. Step 2: Convert to fraction form
    98.70/148.79 = 92.09/x
  3. Step 3: Cross multiply
    98.70x = 148.79 × 92.09
  4. Step 4: Simplify right side
    98.70x = 13,702.07
  5. Step 5: Solve for x
    x = 13,702.07/98.70
  6. Step 6: Final answer
    x = 138.83

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.