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Finding the Fourth Proportional to 817.14, 1,218.52 and 809.84

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Solution

The fourth proportional to 817.14, 1,218.52 and 809.84 is: 1,207.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.14 : 1,218.52 = 809.84 : x
  2. Step 2: Convert to fraction form
    817.14/1,218.52 = 809.84/x
  3. Step 3: Cross multiply
    817.14x = 1,218.52 × 809.84
  4. Step 4: Simplify right side
    817.14x = 986,806.24
  5. Step 5: Solve for x
    x = 986,806.24/817.14
  6. Step 6: Final answer
    x = 1,207.63

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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.