Home / 3,942.20-5,913.30-3,315.80

Finding the Fourth Proportional to 3,942.20, 5,913.30 and 3,315.80

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Solution

The fourth proportional to 3,942.20, 5,913.30 and 3,315.80 is: 4,973.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,942.20 : 5,913.30 = 3,315.80 : x
  2. Step 2: Convert to fraction form
    3,942.20/5,913.30 = 3,315.80/x
  3. Step 3: Cross multiply
    3,942.20x = 5,913.30 × 3,315.80
  4. Step 4: Simplify right side
    3,942.20x = 19,607,320.14
  5. Step 5: Solve for x
    x = 19,607,320.14/3,942.20
  6. Step 6: Final answer
    x = 4,973.70

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Similar ratio
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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.