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Finding the Fourth Proportional to 186.77, 280.15 and 78.55

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Solution

The fourth proportional to 186.77, 280.15 and 78.55 is: 117.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.77 : 280.15 = 78.55 : x
  2. Step 2: Convert to fraction form
    186.77/280.15 = 78.55/x
  3. Step 3: Cross multiply
    186.77x = 280.15 × 78.55
  4. Step 4: Simplify right side
    186.77x = 22,004.89
  5. Step 5: Solve for x
    x = 22,004.89/186.77
  6. Step 6: Final answer
    x = 117.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.