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Finding the Fourth Proportional to 718.25, 1,076.74 and 279.20

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Solution

The fourth proportional to 718.25, 1,076.74 and 279.20 is: 418.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.25 : 1,076.74 = 279.20 : x
  2. Step 2: Convert to fraction form
    718.25/1,076.74 = 279.20/x
  3. Step 3: Cross multiply
    718.25x = 1,076.74 × 279.20
  4. Step 4: Simplify right side
    718.25x = 300,619.73
  5. Step 5: Solve for x
    x = 300,619.73/718.25
  6. Step 6: Final answer
    x = 418.55

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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.