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Finding the Fourth Proportional to 806.22, 1,206.09 and 644.22

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Solution

The fourth proportional to 806.22, 1,206.09 and 644.22 is: 963.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.22 : 1,206.09 = 644.22 : x
  2. Step 2: Convert to fraction form
    806.22/1,206.09 = 644.22/x
  3. Step 3: Cross multiply
    806.22x = 1,206.09 × 644.22
  4. Step 4: Simplify right side
    806.22x = 776,987.30
  5. Step 5: Solve for x
    x = 776,987.30/806.22
  6. Step 6: Final answer
    x = 963.74

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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.