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Finding the Fourth Proportional to 7,941.20, 11,911.80 and 7,212.20

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Solution

The fourth proportional to 7,941.20, 11,911.80 and 7,212.20 is: 10,818.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,941.20 : 11,911.80 = 7,212.20 : x
  2. Step 2: Convert to fraction form
    7,941.20/11,911.80 = 7,212.20/x
  3. Step 3: Cross multiply
    7,941.20x = 11,911.80 × 7,212.20
  4. Step 4: Simplify right side
    7,941.20x = 85,910,283.96
  5. Step 5: Solve for x
    x = 85,910,283.96/7,941.20
  6. Step 6: Final answer
    x = 10,818.30

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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.