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Finding the Fourth Proportional to 6,912.80, 10,369.20 and 5,919.20

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Solution

The fourth proportional to 6,912.80, 10,369.20 and 5,919.20 is: 8,878.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,912.80 : 10,369.20 = 5,919.20 : x
  2. Step 2: Convert to fraction form
    6,912.80/10,369.20 = 5,919.20/x
  3. Step 3: Cross multiply
    6,912.80x = 10,369.20 × 5,919.20
  4. Step 4: Simplify right side
    6,912.80x = 61,377,368.64
  5. Step 5: Solve for x
    x = 61,377,368.64/6,912.80
  6. Step 6: Final answer
    x = 8,878.80

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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.