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Finding the Fourth Proportional to 7,107.89, 9,808.90 and 3,964.28

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Solution

The fourth proportional to 7,107.89, 9,808.90 and 3,964.28 is: 5,470.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,107.89 : 9,808.90 = 3,964.28 : x
  2. Step 2: Convert to fraction form
    7,107.89/9,808.90 = 3,964.28/x
  3. Step 3: Cross multiply
    7,107.89x = 9,808.90 × 3,964.28
  4. Step 4: Simplify right side
    7,107.89x = 38,885,167.14
  5. Step 5: Solve for x
    x = 38,885,167.14/7,107.89
  6. Step 6: Final answer
    x = 5,470.71

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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.