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Finding the Third Proportional to 186.75 and 278.72

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Solution

The third proportional to 186.75 and 278.72 is: 415.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.75 : 278.72 = 278.72 : x
  2. Step 2: Convert to fraction form
    186.75/278.72 = 278.72/x
  3. Step 3: Cross multiply
    186.75x = 278.72 × 278.72
  4. Step 4: Simplify right side
    186.75x = 77,684.14
  5. Step 5: Solve for x
    x = 77,684.14/186.75
  6. Step 6: Final answer
    x = 415.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.