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Finding the Fourth Proportional to 191.60, 287.24 and 69.78

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Solution

The fourth proportional to 191.60, 287.24 and 69.78 is: 104.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.60 : 287.24 = 69.78 : x
  2. Step 2: Convert to fraction form
    191.60/287.24 = 69.78/x
  3. Step 3: Cross multiply
    191.60x = 287.24 × 69.78
  4. Step 4: Simplify right side
    191.60x = 20,043.26
  5. Step 5: Solve for x
    x = 20,043.26/191.60
  6. Step 6: Final answer
    x = 104.61

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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.