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Finding the Fourth Proportional to 122.04, 168.28 and 90.92

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Solution

The fourth proportional to 122.04, 168.28 and 90.92 is: 125.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.04 : 168.28 = 90.92 : x
  2. Step 2: Convert to fraction form
    122.04/168.28 = 90.92/x
  3. Step 3: Cross multiply
    122.04x = 168.28 × 90.92
  4. Step 4: Simplify right side
    122.04x = 15,300.02
  5. Step 5: Solve for x
    x = 15,300.02/122.04
  6. Step 6: Final answer
    x = 125.37

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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.