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Finding the Fourth Proportional to 868.89, 1,199.82 and 634.17

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Solution

The fourth proportional to 868.89, 1,199.82 and 634.17 is: 875.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.89 : 1,199.82 = 634.17 : x
  2. Step 2: Convert to fraction form
    868.89/1,199.82 = 634.17/x
  3. Step 3: Cross multiply
    868.89x = 1,199.82 × 634.17
  4. Step 4: Simplify right side
    868.89x = 760,889.85
  5. Step 5: Solve for x
    x = 760,889.85/868.89
  6. Step 6: Final answer
    x = 875.70

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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.