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Finding the Fourth Proportional to 122.95, 184.43 and 31.65

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Solution

The fourth proportional to 122.95, 184.43 and 31.65 is: 47.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.95 : 184.43 = 31.65 : x
  2. Step 2: Convert to fraction form
    122.95/184.43 = 31.65/x
  3. Step 3: Cross multiply
    122.95x = 184.43 × 31.65
  4. Step 4: Simplify right side
    122.95x = 5,836.36
  5. Step 5: Solve for x
    x = 5,836.36/122.95
  6. Step 6: Final answer
    x = 47.47

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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.