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Finding the Fourth Proportional to 7,171.46, 9,896.74 and 3,985.05

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Solution

The fourth proportional to 7,171.46, 9,896.74 and 3,985.05 is: 5,499.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,171.46 : 9,896.74 = 3,985.05 : x
  2. Step 2: Convert to fraction form
    7,171.46/9,896.74 = 3,985.05/x
  3. Step 3: Cross multiply
    7,171.46x = 9,896.74 × 3,985.05
  4. Step 4: Simplify right side
    7,171.46x = 39,438,934.33
  5. Step 5: Solve for x
    x = 39,438,934.33/7,171.46
  6. Step 6: Final answer
    x = 5,499.43

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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.