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Finding the Fourth Proportional to 6,642.36, 9,167.18 and 3,989.61

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Solution

The fourth proportional to 6,642.36, 9,167.18 and 3,989.61 is: 5,506.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,642.36 : 9,167.18 = 3,989.61 : x
  2. Step 2: Convert to fraction form
    6,642.36/9,167.18 = 3,989.61/x
  3. Step 3: Cross multiply
    6,642.36x = 9,167.18 × 3,989.61
  4. Step 4: Simplify right side
    6,642.36x = 36,573,453.05
  5. Step 5: Solve for x
    x = 36,573,453.05/6,642.36
  6. Step 6: Final answer
    x = 5,506.09

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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.