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Finding the Fourth Proportional to 1,294.35, 1,786.95 and 921.75

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Solution

The fourth proportional to 1,294.35, 1,786.95 and 921.75 is: 1,272.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,294.35 : 1,786.95 = 921.75 : x
  2. Step 2: Convert to fraction form
    1,294.35/1,786.95 = 921.75/x
  3. Step 3: Cross multiply
    1,294.35x = 1,786.95 × 921.75
  4. Step 4: Simplify right side
    1,294.35x = 1,647,121.16
  5. Step 5: Solve for x
    x = 1,647,121.16/1,294.35
  6. Step 6: Final answer
    x = 1,272.55

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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.