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Finding the Fourth Proportional to 908.80, 1,260 and 890.98

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Solution

The fourth proportional to 908.80, 1,260 and 890.98 is: 1,235.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.80 : 1,260 = 890.98 : x
  2. Step 2: Convert to fraction form
    908.80/1,260 = 890.98/x
  3. Step 3: Cross multiply
    908.80x = 1,260 × 890.98
  4. Step 4: Simplify right side
    908.80x = 1,122,634.80
  5. Step 5: Solve for x
    x = 1,122,634.80/908.80
  6. Step 6: Final answer
    x = 1,235.29

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.