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Finding the Fourth Proportional to 191.60, 287.31 and 69.83

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Solution

The fourth proportional to 191.60, 287.31 and 69.83 is: 104.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.60 : 287.31 = 69.83 : x
  2. Step 2: Convert to fraction form
    191.60/287.31 = 69.83/x
  3. Step 3: Cross multiply
    191.60x = 287.31 × 69.83
  4. Step 4: Simplify right side
    191.60x = 20,062.86
  5. Step 5: Solve for x
    x = 20,062.86/191.60
  6. Step 6: Final answer
    x = 104.71

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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.