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Finding the Fourth Proportional to 1,108.07, 1,659.12 and 868.20

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Solution

The fourth proportional to 1,108.07, 1,659.12 and 868.20 is: 1,299.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.07 : 1,659.12 = 868.20 : x
  2. Step 2: Convert to fraction form
    1,108.07/1,659.12 = 868.20/x
  3. Step 3: Cross multiply
    1,108.07x = 1,659.12 × 868.20
  4. Step 4: Simplify right side
    1,108.07x = 1,440,447.98
  5. Step 5: Solve for x
    x = 1,440,447.98/1,108.07
  6. Step 6: Final answer
    x = 1,299.97

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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.