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Finding the Fourth Proportional to 122.18, 182.38 and 105.17

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Solution

The fourth proportional to 122.18, 182.38 and 105.17 is: 156.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.18 : 182.38 = 105.17 : x
  2. Step 2: Convert to fraction form
    122.18/182.38 = 105.17/x
  3. Step 3: Cross multiply
    122.18x = 182.38 × 105.17
  4. Step 4: Simplify right side
    122.18x = 19,180.45
  5. Step 5: Solve for x
    x = 19,180.45/122.18
  6. Step 6: Final answer
    x = 156.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.