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Finding the Fourth Proportional to 872.73, 1,309.80 and 770.22

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Solution

The fourth proportional to 872.73, 1,309.80 and 770.22 is: 1,155.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.73 : 1,309.80 = 770.22 : x
  2. Step 2: Convert to fraction form
    872.73/1,309.80 = 770.22/x
  3. Step 3: Cross multiply
    872.73x = 1,309.80 × 770.22
  4. Step 4: Simplify right side
    872.73x = 1,008,834.16
  5. Step 5: Solve for x
    x = 1,008,834.16/872.73
  6. Step 6: Final answer
    x = 1,155.95

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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.