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Finding the Fourth Proportional to 249.71, 344.58 and 139.18

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Solution

The fourth proportional to 249.71, 344.58 and 139.18 is: 192.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.71 : 344.58 = 139.18 : x
  2. Step 2: Convert to fraction form
    249.71/344.58 = 139.18/x
  3. Step 3: Cross multiply
    249.71x = 344.58 × 139.18
  4. Step 4: Simplify right side
    249.71x = 47,957.09
  5. Step 5: Solve for x
    x = 47,957.09/249.71
  6. Step 6: Final answer
    x = 192.05

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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.