Home / 7,135.20-9,846.18-3,990.78

Finding the Fourth Proportional to 7,135.20, 9,846.18 and 3,990.78

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Solution

The fourth proportional to 7,135.20, 9,846.18 and 3,990.78 is: 5,507.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,135.20 : 9,846.18 = 3,990.78 : x
  2. Step 2: Convert to fraction form
    7,135.20/9,846.18 = 3,990.78/x
  3. Step 3: Cross multiply
    7,135.20x = 9,846.18 × 3,990.78
  4. Step 4: Simplify right side
    7,135.20x = 39,293,938.22
  5. Step 5: Solve for x
    x = 39,293,938.22/7,135.20
  6. Step 6: Final answer
    x = 5,507.05

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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.