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Finding the Fourth Proportional to 908.87, 1,244.85 and 855.68

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Solution

The fourth proportional to 908.87, 1,244.85 and 855.68 is: 1,172.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.87 : 1,244.85 = 855.68 : x
  2. Step 2: Convert to fraction form
    908.87/1,244.85 = 855.68/x
  3. Step 3: Cross multiply
    908.87x = 1,244.85 × 855.68
  4. Step 4: Simplify right side
    908.87x = 1,065,193.25
  5. Step 5: Solve for x
    x = 1,065,193.25/908.87
  6. Step 6: Final answer
    x = 1,172.00

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.