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Finding the Fourth Proportional to 1,291.88, 1,934.94 and 908.84

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Solution

The fourth proportional to 1,291.88, 1,934.94 and 908.84 is: 1,361.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.88 : 1,934.94 = 908.84 : x
  2. Step 2: Convert to fraction form
    1,291.88/1,934.94 = 908.84/x
  3. Step 3: Cross multiply
    1,291.88x = 1,934.94 × 908.84
  4. Step 4: Simplify right side
    1,291.88x = 1,758,550.87
  5. Step 5: Solve for x
    x = 1,758,550.87/1,291.88
  6. Step 6: Final answer
    x = 1,361.23

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1.5x scale

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.