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Finding the Fourth Proportional to 872, 1,308.21 and 255.71

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Solution

The fourth proportional to 872, 1,308.21 and 255.71 is: 383.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    872 : 1,308.21 = 255.71 : x
  2. Step 2: Convert to fraction form
    872/1,308.21 = 255.71/x
  3. Step 3: Cross multiply
    872x = 1,308.21 × 255.71
  4. Step 4: Simplify right side
    872x = 334,515.84
  5. Step 5: Solve for x
    x = 334,515.84/872
  6. Step 6: Final answer
    x = 383.62

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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.