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Finding the Fourth Proportional to 7,968.80, 11,947.80 and 4,221.20

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Solution

The fourth proportional to 7,968.80, 11,947.80 and 4,221.20 is: 6,328.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,968.80 : 11,947.80 = 4,221.20 : x
  2. Step 2: Convert to fraction form
    7,968.80/11,947.80 = 4,221.20/x
  3. Step 3: Cross multiply
    7,968.80x = 11,947.80 × 4,221.20
  4. Step 4: Simplify right side
    7,968.80x = 50,434,053.36
  5. Step 5: Solve for x
    x = 50,434,053.36/7,968.80
  6. Step 6: Final answer
    x = 6,328.94

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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.