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Finding the Fourth Proportional to 360.12, 539.78 and 278.72

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Solution

The fourth proportional to 360.12, 539.78 and 278.72 is: 417.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    360.12 : 539.78 = 278.72 : x
  2. Step 2: Convert to fraction form
    360.12/539.78 = 278.72/x
  3. Step 3: Cross multiply
    360.12x = 539.78 × 278.72
  4. Step 4: Simplify right side
    360.12x = 150,443.39
  5. Step 5: Solve for x
    x = 150,443.39/360.12
  6. Step 6: Final answer
    x = 417.76

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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.