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Finding the Fourth Proportional to 194.18, 291.85 and 129.40

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Solution

The fourth proportional to 194.18, 291.85 and 129.40 is: 194.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.18 : 291.85 = 129.40 : x
  2. Step 2: Convert to fraction form
    194.18/291.85 = 129.40/x
  3. Step 3: Cross multiply
    194.18x = 291.85 × 129.40
  4. Step 4: Simplify right side
    194.18x = 37,764.34
  5. Step 5: Solve for x
    x = 37,764.34/194.18
  6. Step 6: Final answer
    x = 194.48

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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.