Home / 7,130.80-9,839.10-3,986.38

Finding the Fourth Proportional to 7,130.80, 9,839.10 and 3,986.38

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Solution

The fourth proportional to 7,130.80, 9,839.10 and 3,986.38 is: 5,500.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,130.80 : 9,839.10 = 3,986.38 : x
  2. Step 2: Convert to fraction form
    7,130.80/9,839.10 = 3,986.38/x
  3. Step 3: Cross multiply
    7,130.80x = 9,839.10 × 3,986.38
  4. Step 4: Simplify right side
    7,130.80x = 39,222,391.46
  5. Step 5: Solve for x
    x = 39,222,391.46/7,130.80
  6. Step 6: Final answer
    x = 5,500.42

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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.