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Finding the Fourth Proportional to 360.49, 540.66 and 129.40

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Solution

The fourth proportional to 360.49, 540.66 and 129.40 is: 194.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    360.49 : 540.66 = 129.40 : x
  2. Step 2: Convert to fraction form
    360.49/540.66 = 129.40/x
  3. Step 3: Cross multiply
    360.49x = 540.66 × 129.40
  4. Step 4: Simplify right side
    360.49x = 69,958.05
  5. Step 5: Solve for x
    x = 69,958.05/360.49
  6. Step 6: Final answer
    x = 194.06

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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.