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Finding the Fourth Proportional to 1,218.91, 1,680.34 and 868.99

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Solution

The fourth proportional to 1,218.91, 1,680.34 and 868.99 is: 1,197.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.91 : 1,680.34 = 868.99 : x
  2. Step 2: Convert to fraction form
    1,218.91/1,680.34 = 868.99/x
  3. Step 3: Cross multiply
    1,218.91x = 1,680.34 × 868.99
  4. Step 4: Simplify right side
    1,218.91x = 1,460,198.66
  5. Step 5: Solve for x
    x = 1,460,198.66/1,218.91
  6. Step 6: Final answer
    x = 1,197.95

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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.