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Finding the Fourth Proportional to 122.50, 169.20 and 98.05

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Solution

The fourth proportional to 122.50, 169.20 and 98.05 is: 135.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.50 : 169.20 = 98.05 : x
  2. Step 2: Convert to fraction form
    122.50/169.20 = 98.05/x
  3. Step 3: Cross multiply
    122.50x = 169.20 × 98.05
  4. Step 4: Simplify right side
    122.50x = 16,590.06
  5. Step 5: Solve for x
    x = 16,590.06/122.50
  6. Step 6: Final answer
    x = 135.43

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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.