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Finding the Fourth Proportional to 186.65, 257.59 and 103.78

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Solution

The fourth proportional to 186.65, 257.59 and 103.78 is: 143.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.65 : 257.59 = 103.78 : x
  2. Step 2: Convert to fraction form
    186.65/257.59 = 103.78/x
  3. Step 3: Cross multiply
    186.65x = 257.59 × 103.78
  4. Step 4: Simplify right side
    186.65x = 26,731.69
  5. Step 5: Solve for x
    x = 26,731.69/186.65
  6. Step 6: Final answer
    x = 143.22

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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.