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Finding the Fourth Proportional to 360.30, 540.40 and 255.74

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Solution

The fourth proportional to 360.30, 540.40 and 255.74 is: 383.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    360.30 : 540.40 = 255.74 : x
  2. Step 2: Convert to fraction form
    360.30/540.40 = 255.74/x
  3. Step 3: Cross multiply
    360.30x = 540.40 × 255.74
  4. Step 4: Simplify right side
    360.30x = 138,201.90
  5. Step 5: Solve for x
    x = 138,201.90/360.30
  6. Step 6: Final answer
    x = 383.57

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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.