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Finding the Fourth Proportional to 186.61, 257.55 and 111.90

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Solution

The fourth proportional to 186.61, 257.55 and 111.90 is: 154.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.61 : 257.55 = 111.90 : x
  2. Step 2: Convert to fraction form
    186.61/257.55 = 111.90/x
  3. Step 3: Cross multiply
    186.61x = 257.55 × 111.90
  4. Step 4: Simplify right side
    186.61x = 28,819.85
  5. Step 5: Solve for x
    x = 28,819.85/186.61
  6. Step 6: Final answer
    x = 154.44

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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.