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Finding the Fourth Proportional to 191.23, 286.32 and 126.31

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Solution

The fourth proportional to 191.23, 286.32 and 126.31 is: 189.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.23 : 286.32 = 126.31 : x
  2. Step 2: Convert to fraction form
    191.23/286.32 = 126.31/x
  3. Step 3: Cross multiply
    191.23x = 286.32 × 126.31
  4. Step 4: Simplify right side
    191.23x = 36,165.08
  5. Step 5: Solve for x
    x = 36,165.08/191.23
  6. Step 6: Final answer
    x = 189.12

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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.