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Finding the Fourth Proportional to 818.87, 1,222.85 and 776.75

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Solution

The fourth proportional to 818.87, 1,222.85 and 776.75 is: 1,159.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.87 : 1,222.85 = 776.75 : x
  2. Step 2: Convert to fraction form
    818.87/1,222.85 = 776.75/x
  3. Step 3: Cross multiply
    818.87x = 1,222.85 × 776.75
  4. Step 4: Simplify right side
    818.87x = 949,844.57
  5. Step 5: Solve for x
    x = 949,844.57/818.87
  6. Step 6: Final answer
    x = 1,159.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.