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Finding the Fourth Proportional to 1,393.26, 1,921.89 and 868.38

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Solution

The fourth proportional to 1,393.26, 1,921.89 and 868.38 is: 1,197.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.26 : 1,921.89 = 868.38 : x
  2. Step 2: Convert to fraction form
    1,393.26/1,921.89 = 868.38/x
  3. Step 3: Cross multiply
    1,393.26x = 1,921.89 × 868.38
  4. Step 4: Simplify right side
    1,393.26x = 1,668,930.84
  5. Step 5: Solve for x
    x = 1,668,930.84/1,393.26
  6. Step 6: Final answer
    x = 1,197.86

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1.5x scale

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.