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Finding the Fourth Proportional to 806.21, 1,108.08 and 712.40

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Solution

The fourth proportional to 806.21, 1,108.08 and 712.40 is: 979.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.21 : 1,108.08 = 712.40 : x
  2. Step 2: Convert to fraction form
    806.21/1,108.08 = 712.40/x
  3. Step 3: Cross multiply
    806.21x = 1,108.08 × 712.40
  4. Step 4: Simplify right side
    806.21x = 789,396.19
  5. Step 5: Solve for x
    x = 789,396.19/806.21
  6. Step 6: Final answer
    x = 979.14

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.