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Finding the Fourth Proportional to 6,986.81, 9,641.66 and 3,920.64

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Solution

The fourth proportional to 6,986.81, 9,641.66 and 3,920.64 is: 5,410.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,986.81 : 9,641.66 = 3,920.64 : x
  2. Step 2: Convert to fraction form
    6,986.81/9,641.66 = 3,920.64/x
  3. Step 3: Cross multiply
    6,986.81x = 9,641.66 × 3,920.64
  4. Step 4: Simplify right side
    6,986.81x = 37,801,458.26
  5. Step 5: Solve for x
    x = 37,801,458.26/6,986.81
  6. Step 6: Final answer
    x = 5,410.41

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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.