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Finding the Fourth Proportional to 868.88, 1,293.40 and 855.92

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Solution

The fourth proportional to 868.88, 1,293.40 and 855.92 is: 1,274.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.88 : 1,293.40 = 855.92 : x
  2. Step 2: Convert to fraction form
    868.88/1,293.40 = 855.92/x
  3. Step 3: Cross multiply
    868.88x = 1,293.40 × 855.92
  4. Step 4: Simplify right side
    868.88x = 1,107,046.93
  5. Step 5: Solve for x
    x = 1,107,046.93/868.88
  6. Step 6: Final answer
    x = 1,274.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.