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Finding the Fourth Proportional to 811.68, 1,216.98 and 663.05

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Solution

The fourth proportional to 811.68, 1,216.98 and 663.05 is: 994.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.68 : 1,216.98 = 663.05 : x
  2. Step 2: Convert to fraction form
    811.68/1,216.98 = 663.05/x
  3. Step 3: Cross multiply
    811.68x = 1,216.98 × 663.05
  4. Step 4: Simplify right side
    811.68x = 806,912.50
  5. Step 5: Solve for x
    x = 806,912.50/811.68
  6. Step 6: Final answer
    x = 994.13

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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.