Home / 6,428.20-9,642.30-3,147.70

Finding the Fourth Proportional to 6,428.20, 9,642.30 and 3,147.70

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Solution

The fourth proportional to 6,428.20, 9,642.30 and 3,147.70 is: 4,721.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,428.20 : 9,642.30 = 3,147.70 : x
  2. Step 2: Convert to fraction form
    6,428.20/9,642.30 = 3,147.70/x
  3. Step 3: Cross multiply
    6,428.20x = 9,642.30 × 3,147.70
  4. Step 4: Simplify right side
    6,428.20x = 30,351,067.71
  5. Step 5: Solve for x
    x = 30,351,067.71/6,428.20
  6. Step 6: Final answer
    x = 4,721.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.