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Finding the Fourth Proportional to 186.66, 257.61 and 103.79

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Solution

The fourth proportional to 186.66, 257.61 and 103.79 is: 143.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.66 : 257.61 = 103.79 : x
  2. Step 2: Convert to fraction form
    186.66/257.61 = 103.79/x
  3. Step 3: Cross multiply
    186.66x = 257.61 × 103.79
  4. Step 4: Simplify right side
    186.66x = 26,738.38
  5. Step 5: Solve for x
    x = 26,738.38/186.66
  6. Step 6: Final answer
    x = 143.25

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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.