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Finding the Fourth Proportional to 806.11, 1,114.66 and 640.03

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Solution

The fourth proportional to 806.11, 1,114.66 and 640.03 is: 885.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.11 : 1,114.66 = 640.03 : x
  2. Step 2: Convert to fraction form
    806.11/1,114.66 = 640.03/x
  3. Step 3: Cross multiply
    806.11x = 1,114.66 × 640.03
  4. Step 4: Simplify right side
    806.11x = 713,408.67
  5. Step 5: Solve for x
    x = 713,408.67/806.11
  6. Step 6: Final answer
    x = 885.01

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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.