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Finding the Fourth Proportional to 122.99, 169.74 and 71.24

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Solution

The fourth proportional to 122.99, 169.74 and 71.24 is: 98.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.99 : 169.74 = 71.24 : x
  2. Step 2: Convert to fraction form
    122.99/169.74 = 71.24/x
  3. Step 3: Cross multiply
    122.99x = 169.74 × 71.24
  4. Step 4: Simplify right side
    122.99x = 12,092.28
  5. Step 5: Solve for x
    x = 12,092.28/122.99
  6. Step 6: Final answer
    x = 98.32

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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.