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Finding the Fourth Proportional to 249.65, 344.50 and 139.12

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Solution

The fourth proportional to 249.65, 344.50 and 139.12 is: 191.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.65 : 344.50 = 139.12 : x
  2. Step 2: Convert to fraction form
    249.65/344.50 = 139.12/x
  3. Step 3: Cross multiply
    249.65x = 344.50 × 139.12
  4. Step 4: Simplify right side
    249.65x = 47,926.84
  5. Step 5: Solve for x
    x = 47,926.84/249.65
  6. Step 6: Final answer
    x = 191.98

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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.