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Finding the Fourth Proportional to 811.05, 1,117.83 and 634.03

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Solution

The fourth proportional to 811.05, 1,117.83 and 634.03 is: 873.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.05 : 1,117.83 = 634.03 : x
  2. Step 2: Convert to fraction form
    811.05/1,117.83 = 634.03/x
  3. Step 3: Cross multiply
    811.05x = 1,117.83 × 634.03
  4. Step 4: Simplify right side
    811.05x = 708,737.34
  5. Step 5: Solve for x
    x = 708,737.34/811.05
  6. Step 6: Final answer
    x = 873.86

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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.