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Finding the Fourth Proportional to 191.90, 287.87 and 76.34

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Solution

The fourth proportional to 191.90, 287.87 and 76.34 is: 114.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.90 : 287.87 = 76.34 : x
  2. Step 2: Convert to fraction form
    191.90/287.87 = 76.34/x
  3. Step 3: Cross multiply
    191.90x = 287.87 × 76.34
  4. Step 4: Simplify right side
    191.90x = 21,974.17
  5. Step 5: Solve for x
    x = 21,974.17/191.90
  6. Step 6: Final answer
    x = 114.51

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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.