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Finding the Fourth Proportional to 1,291.94, 1,937.92 and 908.90

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Solution

The fourth proportional to 1,291.94, 1,937.92 and 908.90 is: 1,363.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.94 : 1,937.92 = 908.90 : x
  2. Step 2: Convert to fraction form
    1,291.94/1,937.92 = 908.90/x
  3. Step 3: Cross multiply
    1,291.94x = 1,937.92 × 908.90
  4. Step 4: Simplify right side
    1,291.94x = 1,761,375.49
  5. Step 5: Solve for x
    x = 1,761,375.49/1,291.94
  6. Step 6: Final answer
    x = 1,363.36

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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.