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Finding the Fourth Proportional to 871.67, 1,307.71 and 255.43

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Solution

The fourth proportional to 871.67, 1,307.71 and 255.43 is: 383.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.67 : 1,307.71 = 255.43 : x
  2. Step 2: Convert to fraction form
    871.67/1,307.71 = 255.43/x
  3. Step 3: Cross multiply
    871.67x = 1,307.71 × 255.43
  4. Step 4: Simplify right side
    871.67x = 334,028.37
  5. Step 5: Solve for x
    x = 334,028.37/871.67
  6. Step 6: Final answer
    x = 383.21

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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.