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Finding the Fourth Proportional to 908.21, 1,252.90 and 571.96

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Solution

The fourth proportional to 908.21, 1,252.90 and 571.96 is: 789.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.21 : 1,252.90 = 571.96 : x
  2. Step 2: Convert to fraction form
    908.21/1,252.90 = 571.96/x
  3. Step 3: Cross multiply
    908.21x = 1,252.90 × 571.96
  4. Step 4: Simplify right side
    908.21x = 716,600.70
  5. Step 5: Solve for x
    x = 716,600.70/908.21
  6. Step 6: Final answer
    x = 789.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.