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Finding the Fourth Proportional to 806.09, 1,110.92 and 618.84

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Solution

The fourth proportional to 806.09, 1,110.92 and 618.84 is: 852.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.09 : 1,110.92 = 618.84 : x
  2. Step 2: Convert to fraction form
    806.09/1,110.92 = 618.84/x
  3. Step 3: Cross multiply
    806.09x = 1,110.92 × 618.84
  4. Step 4: Simplify right side
    806.09x = 687,478.64
  5. Step 5: Solve for x
    x = 687,478.64/806.09
  6. Step 6: Final answer
    x = 852.86

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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.