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Finding the Fourth Proportional to 671.77, 1,008.11 and 255.67

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Solution

The fourth proportional to 671.77, 1,008.11 and 255.67 is: 383.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.77 : 1,008.11 = 255.67 : x
  2. Step 2: Convert to fraction form
    671.77/1,008.11 = 255.67/x
  3. Step 3: Cross multiply
    671.77x = 1,008.11 × 255.67
  4. Step 4: Simplify right side
    671.77x = 257,743.48
  5. Step 5: Solve for x
    x = 257,743.48/671.77
  6. Step 6: Final answer
    x = 383.68

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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.