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Finding the Fourth Proportional to 654.11, 981.29 and 191.90

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Solution

The fourth proportional to 654.11, 981.29 and 191.90 is: 287.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.11 : 981.29 = 191.90 : x
  2. Step 2: Convert to fraction form
    654.11/981.29 = 191.90/x
  3. Step 3: Cross multiply
    654.11x = 981.29 × 191.90
  4. Step 4: Simplify right side
    654.11x = 188,305.12
  5. Step 5: Solve for x
    x = 188,305.12/654.11
  6. Step 6: Final answer
    x = 287.88

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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.