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Finding the Fourth Proportional to 718.11, 1,076.85 and 255.74

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Solution

The fourth proportional to 718.11, 1,076.85 and 255.74 is: 383.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.11 : 1,076.85 = 255.74 : x
  2. Step 2: Convert to fraction form
    718.11/1,076.85 = 255.74/x
  3. Step 3: Cross multiply
    718.11x = 1,076.85 × 255.74
  4. Step 4: Simplify right side
    718.11x = 275,393.62
  5. Step 5: Solve for x
    x = 275,393.62/718.11
  6. Step 6: Final answer
    x = 383.50

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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.