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Finding the Fourth Proportional to 122.76, 169.57 and 90.19

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Solution

The fourth proportional to 122.76, 169.57 and 90.19 is: 124.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.76 : 169.57 = 90.19 : x
  2. Step 2: Convert to fraction form
    122.76/169.57 = 90.19/x
  3. Step 3: Cross multiply
    122.76x = 169.57 × 90.19
  4. Step 4: Simplify right side
    122.76x = 15,293.52
  5. Step 5: Solve for x
    x = 15,293.52/122.76
  6. Step 6: Final answer
    x = 124.58

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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.