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Finding the Fourth Proportional to 186.74, 280.12 and 78.42

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Solution

The fourth proportional to 186.74, 280.12 and 78.42 is: 117.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.74 : 280.12 = 78.42 : x
  2. Step 2: Convert to fraction form
    186.74/280.12 = 78.42/x
  3. Step 3: Cross multiply
    186.74x = 280.12 × 78.42
  4. Step 4: Simplify right side
    186.74x = 21,967.01
  5. Step 5: Solve for x
    x = 21,967.01/186.74
  6. Step 6: Final answer
    x = 117.63

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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.