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Finding the Fourth Proportional to 122.80, 169.38 and 100.93

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Solution

The fourth proportional to 122.80, 169.38 and 100.93 is: 139.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.80 : 169.38 = 100.93 : x
  2. Step 2: Convert to fraction form
    122.80/169.38 = 100.93/x
  3. Step 3: Cross multiply
    122.80x = 169.38 × 100.93
  4. Step 4: Simplify right side
    122.80x = 17,095.52
  5. Step 5: Solve for x
    x = 17,095.52/122.80
  6. Step 6: Final answer
    x = 139.21

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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.