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Finding the Fourth Proportional to 186.37, 257.20 and 111.74

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Solution

The fourth proportional to 186.37, 257.20 and 111.74 is: 154.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.37 : 257.20 = 111.74 : x
  2. Step 2: Convert to fraction form
    186.37/257.20 = 111.74/x
  3. Step 3: Cross multiply
    186.37x = 257.20 × 111.74
  4. Step 4: Simplify right side
    186.37x = 28,737.96
  5. Step 5: Solve for x
    x = 28,737.96/186.37
  6. Step 6: Final answer
    x = 154.20

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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.