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Finding the Fourth Proportional to 191.10, 286.39 and 99.61

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Solution

The fourth proportional to 191.10, 286.39 and 99.61 is: 149.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.10 : 286.39 = 99.61 : x
  2. Step 2: Convert to fraction form
    191.10/286.39 = 99.61/x
  3. Step 3: Cross multiply
    191.10x = 286.39 × 99.61
  4. Step 4: Simplify right side
    191.10x = 28,527.31
  5. Step 5: Solve for x
    x = 28,527.31/191.10
  6. Step 6: Final answer
    x = 149.28

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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.