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Finding the Fourth Proportional to 806.85, 1,205.19 and 644.04

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Solution

The fourth proportional to 806.85, 1,205.19 and 644.04 is: 962.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.85 : 1,205.19 = 644.04 : x
  2. Step 2: Convert to fraction form
    806.85/1,205.19 = 644.04/x
  3. Step 3: Cross multiply
    806.85x = 1,205.19 × 644.04
  4. Step 4: Simplify right side
    806.85x = 776,190.57
  5. Step 5: Solve for x
    x = 776,190.57/806.85
  6. Step 6: Final answer
    x = 962.00

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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.