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Finding the Fourth Proportional to 6,642.96, 9,167.31 and 3,990.41

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Solution

The fourth proportional to 6,642.96, 9,167.31 and 3,990.41 is: 5,506.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,642.96 : 9,167.31 = 3,990.41 : x
  2. Step 2: Convert to fraction form
    6,642.96/9,167.31 = 3,990.41/x
  3. Step 3: Cross multiply
    6,642.96x = 9,167.31 × 3,990.41
  4. Step 4: Simplify right side
    6,642.96x = 36,581,325.50
  5. Step 5: Solve for x
    x = 36,581,325.50/6,642.96
  6. Step 6: Final answer
    x = 5,506.78

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1.5x scale

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.