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Finding the Fourth Proportional to 186.40, 257.20 and 112.72

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Solution

The fourth proportional to 186.40, 257.20 and 112.72 is: 155.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.40 : 257.20 = 112.72 : x
  2. Step 2: Convert to fraction form
    186.40/257.20 = 112.72/x
  3. Step 3: Cross multiply
    186.40x = 257.20 × 112.72
  4. Step 4: Simplify right side
    186.40x = 28,991.58
  5. Step 5: Solve for x
    x = 28,991.58/186.40
  6. Step 6: Final answer
    x = 155.53

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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.