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Finding the Fourth Proportional to 7,134.78, 9,846.18 and 3,990.96

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Solution

The fourth proportional to 7,134.78, 9,846.18 and 3,990.96 is: 5,507.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,134.78 : 9,846.18 = 3,990.96 : x
  2. Step 2: Convert to fraction form
    7,134.78/9,846.18 = 3,990.96/x
  3. Step 3: Cross multiply
    7,134.78x = 9,846.18 × 3,990.96
  4. Step 4: Simplify right side
    7,134.78x = 39,295,710.53
  5. Step 5: Solve for x
    x = 39,295,710.53/7,134.78
  6. Step 6: Final answer
    x = 5,507.63

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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.