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Finding the Fourth Proportional to 908.11, 1,253.58 and 613.78

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Solution

The fourth proportional to 908.11, 1,253.58 and 613.78 is: 847.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.11 : 1,253.58 = 613.78 : x
  2. Step 2: Convert to fraction form
    908.11/1,253.58 = 613.78/x
  3. Step 3: Cross multiply
    908.11x = 1,253.58 × 613.78
  4. Step 4: Simplify right side
    908.11x = 769,416.90
  5. Step 5: Solve for x
    x = 769,416.90/908.11
  6. Step 6: Final answer
    x = 847.27

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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.