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Finding the Fourth Proportional to 122.55, 169.10 and 72.77

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Solution

The fourth proportional to 122.55, 169.10 and 72.77 is: 100.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.55 : 169.10 = 72.77 : x
  2. Step 2: Convert to fraction form
    122.55/169.10 = 72.77/x
  3. Step 3: Cross multiply
    122.55x = 169.10 × 72.77
  4. Step 4: Simplify right side
    122.55x = 12,305.41
  5. Step 5: Solve for x
    x = 12,305.41/122.55
  6. Step 6: Final answer
    x = 100.41

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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.