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Finding the Fourth Proportional to 186.31, 257.05 and 111.61

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Solution

The fourth proportional to 186.31, 257.05 and 111.61 is: 153.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.31 : 257.05 = 111.61 : x
  2. Step 2: Convert to fraction form
    186.31/257.05 = 111.61/x
  3. Step 3: Cross multiply
    186.31x = 257.05 × 111.61
  4. Step 4: Simplify right side
    186.31x = 28,689.35
  5. Step 5: Solve for x
    x = 28,689.35/186.31
  6. Step 6: Final answer
    x = 153.99

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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.