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Finding the Fourth Proportional to 191.64, 287.28 and 69.90

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Solution

The fourth proportional to 191.64, 287.28 and 69.90 is: 104.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.64 : 287.28 = 69.90 : x
  2. Step 2: Convert to fraction form
    191.64/287.28 = 69.90/x
  3. Step 3: Cross multiply
    191.64x = 287.28 × 69.90
  4. Step 4: Simplify right side
    191.64x = 20,080.87
  5. Step 5: Solve for x
    x = 20,080.87/191.64
  6. Step 6: Final answer
    x = 104.78

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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.