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Finding the Fourth Proportional to 249.66, 345.17 and 187.81

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Solution

The fourth proportional to 249.66, 345.17 and 187.81 is: 259.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.66 : 345.17 = 187.81 : x
  2. Step 2: Convert to fraction form
    249.66/345.17 = 187.81/x
  3. Step 3: Cross multiply
    249.66x = 345.17 × 187.81
  4. Step 4: Simplify right side
    249.66x = 64,825.98
  5. Step 5: Solve for x
    x = 64,825.98/249.66
  6. Step 6: Final answer
    x = 259.66

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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.