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Finding the Fourth Proportional to 191.63, 287.34 and 81.91

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Solution

The fourth proportional to 191.63, 287.34 and 81.91 is: 122.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.63 : 287.34 = 81.91 : x
  2. Step 2: Convert to fraction form
    191.63/287.34 = 81.91/x
  3. Step 3: Cross multiply
    191.63x = 287.34 × 81.91
  4. Step 4: Simplify right side
    191.63x = 23,536.02
  5. Step 5: Solve for x
    x = 23,536.02/191.63
  6. Step 6: Final answer
    x = 122.82

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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.