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Finding the Fourth Proportional to 187.10, 280.39 and 78.96

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Solution

The fourth proportional to 187.10, 280.39 and 78.96 is: 118.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.10 : 280.39 = 78.96 : x
  2. Step 2: Convert to fraction form
    187.10/280.39 = 78.96/x
  3. Step 3: Cross multiply
    187.10x = 280.39 × 78.96
  4. Step 4: Simplify right side
    187.10x = 22,139.59
  5. Step 5: Solve for x
    x = 22,139.59/187.10
  6. Step 6: Final answer
    x = 118.33

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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.