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Finding the Fourth Proportional to 194.77, 292.11 and 86.50

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Solution

The fourth proportional to 194.77, 292.11 and 86.50 is: 129.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.77 : 292.11 = 86.50 : x
  2. Step 2: Convert to fraction form
    194.77/292.11 = 86.50/x
  3. Step 3: Cross multiply
    194.77x = 292.11 × 86.50
  4. Step 4: Simplify right side
    194.77x = 25,267.52
  5. Step 5: Solve for x
    x = 25,267.52/194.77
  6. Step 6: Final answer
    x = 129.73

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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.