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Finding the Fourth Proportional to 191.72, 286.99 and 123.31

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Solution

The fourth proportional to 191.72, 286.99 and 123.31 is: 184.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.72 : 286.99 = 123.31 : x
  2. Step 2: Convert to fraction form
    191.72/286.99 = 123.31/x
  3. Step 3: Cross multiply
    191.72x = 286.99 × 123.31
  4. Step 4: Simplify right side
    191.72x = 35,387.71
  5. Step 5: Solve for x
    x = 35,387.71/191.72
  6. Step 6: Final answer
    x = 184.58

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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.