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Finding the Fourth Proportional to 186.99, 280.49 and 78.65

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Solution

The fourth proportional to 186.99, 280.49 and 78.65 is: 117.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.99 : 280.49 = 78.65 : x
  2. Step 2: Convert to fraction form
    186.99/280.49 = 78.65/x
  3. Step 3: Cross multiply
    186.99x = 280.49 × 78.65
  4. Step 4: Simplify right side
    186.99x = 22,060.85
  5. Step 5: Solve for x
    x = 22,060.85/186.99
  6. Step 6: Final answer
    x = 117.98

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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.