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Finding the Fourth Proportional to 821.89, 1,134.63 and 634.96

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Solution

The fourth proportional to 821.89, 1,134.63 and 634.96 is: 876.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.89 : 1,134.63 = 634.96 : x
  2. Step 2: Convert to fraction form
    821.89/1,134.63 = 634.96/x
  3. Step 3: Cross multiply
    821.89x = 1,134.63 × 634.96
  4. Step 4: Simplify right side
    821.89x = 720,441.49
  5. Step 5: Solve for x
    x = 720,441.49/821.89
  6. Step 6: Final answer
    x = 876.57

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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.