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Finding the Fourth Proportional to 122.47, 183.70 and 31.17

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Solution

The fourth proportional to 122.47, 183.70 and 31.17 is: 46.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.47 : 183.70 = 31.17 : x
  2. Step 2: Convert to fraction form
    122.47/183.70 = 31.17/x
  3. Step 3: Cross multiply
    122.47x = 183.70 × 31.17
  4. Step 4: Simplify right side
    122.47x = 5,725.38
  5. Step 5: Solve for x
    x = 5,725.38/122.47
  6. Step 6: Final answer
    x = 46.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.