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Finding the Fourth Proportional to 7,149.28, 9,865.71 and 4,165.11

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Solution

The fourth proportional to 7,149.28, 9,865.71 and 4,165.11 is: 5,747.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,149.28 : 9,865.71 = 4,165.11 : x
  2. Step 2: Convert to fraction form
    7,149.28/9,865.71 = 4,165.11/x
  3. Step 3: Cross multiply
    7,149.28x = 9,865.71 × 4,165.11
  4. Step 4: Simplify right side
    7,149.28x = 41,091,767.38
  5. Step 5: Solve for x
    x = 41,091,767.38/7,149.28
  6. Step 6: Final answer
    x = 5,747.68

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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.