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Finding the Fourth Proportional to 122.81, 169.95 and 98.51

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Solution

The fourth proportional to 122.81, 169.95 and 98.51 is: 136.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.81 : 169.95 = 98.51 : x
  2. Step 2: Convert to fraction form
    122.81/169.95 = 98.51/x
  3. Step 3: Cross multiply
    122.81x = 169.95 × 98.51
  4. Step 4: Simplify right side
    122.81x = 16,740.92
  5. Step 5: Solve for x
    x = 16,740.92/122.81
  6. Step 6: Final answer
    x = 136.32

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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.