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Finding the Fourth Proportional to 194.43, 291.40 and 85.99

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Solution

The fourth proportional to 194.43, 291.40 and 85.99 is: 128.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.43 : 291.40 = 85.99 : x
  2. Step 2: Convert to fraction form
    194.43/291.40 = 85.99/x
  3. Step 3: Cross multiply
    194.43x = 291.40 × 85.99
  4. Step 4: Simplify right side
    194.43x = 25,057.49
  5. Step 5: Solve for x
    x = 25,057.49/194.43
  6. Step 6: Final answer
    x = 128.88

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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.