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Finding the Fourth Proportional to 186.88, 280.26 and 78.70

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Solution

The fourth proportional to 186.88, 280.26 and 78.70 is: 118.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.88 : 280.26 = 78.70 : x
  2. Step 2: Convert to fraction form
    186.88/280.26 = 78.70/x
  3. Step 3: Cross multiply
    186.88x = 280.26 × 78.70
  4. Step 4: Simplify right side
    186.88x = 22,056.46
  5. Step 5: Solve for x
    x = 22,056.46/186.88
  6. Step 6: Final answer
    x = 118.02

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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.