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Finding the Fourth Proportional to 7,912.72, 10,919.82 and 4,375.72

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Solution

The fourth proportional to 7,912.72, 10,919.82 and 4,375.72 is: 6,038.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,912.72 : 10,919.82 = 4,375.72 : x
  2. Step 2: Convert to fraction form
    7,912.72/10,919.82 = 4,375.72/x
  3. Step 3: Cross multiply
    7,912.72x = 10,919.82 × 4,375.72
  4. Step 4: Simplify right side
    7,912.72x = 47,782,074.77
  5. Step 5: Solve for x
    x = 47,782,074.77/7,912.72
  6. Step 6: Final answer
    x = 6,038.64

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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.