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Finding the Fourth Proportional to 122.96, 169.74 and 76.40

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Solution

The fourth proportional to 122.96, 169.74 and 76.40 is: 105.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.96 : 169.74 = 76.40 : x
  2. Step 2: Convert to fraction form
    122.96/169.74 = 76.40/x
  3. Step 3: Cross multiply
    122.96x = 169.74 × 76.40
  4. Step 4: Simplify right side
    122.96x = 12,967.14
  5. Step 5: Solve for x
    x = 12,967.14/122.96
  6. Step 6: Final answer
    x = 105.46

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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.