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Finding the Fourth Proportional to 360.39, 540.08 and 143.72

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Solution

The fourth proportional to 360.39, 540.08 and 143.72 is: 215.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    360.39 : 540.08 = 143.72 : x
  2. Step 2: Convert to fraction form
    360.39/540.08 = 143.72/x
  3. Step 3: Cross multiply
    360.39x = 540.08 × 143.72
  4. Step 4: Simplify right side
    360.39x = 77,619.44
  5. Step 5: Solve for x
    x = 77,619.44/360.39
  6. Step 6: Final answer
    x = 215.37

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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.