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Finding the Fourth Proportional to 872.07, 1,308.21 and 255.78

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Solution

The fourth proportional to 872.07, 1,308.21 and 255.78 is: 383.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.07 : 1,308.21 = 255.78 : x
  2. Step 2: Convert to fraction form
    872.07/1,308.21 = 255.78/x
  3. Step 3: Cross multiply
    872.07x = 1,308.21 × 255.78
  4. Step 4: Simplify right side
    872.07x = 334,610.19
  5. Step 5: Solve for x
    x = 334,610.19/872.07
  6. Step 6: Final answer
    x = 383.70

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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.