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Finding the Fourth Proportional to 249.69, 344.55 and 139.15

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Solution

The fourth proportional to 249.69, 344.55 and 139.15 is: 192.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.69 : 344.55 = 139.15 : x
  2. Step 2: Convert to fraction form
    249.69/344.55 = 139.15/x
  3. Step 3: Cross multiply
    249.69x = 344.55 × 139.15
  4. Step 4: Simplify right side
    249.69x = 47,944.13
  5. Step 5: Solve for x
    x = 47,944.13/249.69
  6. Step 6: Final answer
    x = 192.01

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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.