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Finding the Fourth Proportional to 194.49, 291.78 and 86.30

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Solution

The fourth proportional to 194.49, 291.78 and 86.30 is: 129.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.49 : 291.78 = 86.30 : x
  2. Step 2: Convert to fraction form
    194.49/291.78 = 86.30/x
  3. Step 3: Cross multiply
    194.49x = 291.78 × 86.30
  4. Step 4: Simplify right side
    194.49x = 25,180.61
  5. Step 5: Solve for x
    x = 25,180.61/194.49
  6. Step 6: Final answer
    x = 129.47

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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.