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Finding the Fourth Proportional to 307.68, 461.40 and 112.61

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Solution

The fourth proportional to 307.68, 461.40 and 112.61 is: 168.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.68 : 461.40 = 112.61 : x
  2. Step 2: Convert to fraction form
    307.68/461.40 = 112.61/x
  3. Step 3: Cross multiply
    307.68x = 461.40 × 112.61
  4. Step 4: Simplify right side
    307.68x = 51,959.62
  5. Step 5: Solve for x
    x = 51,959.62/307.68
  6. Step 6: Final answer
    x = 168.88

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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.