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Finding the Fourth Proportional to 7,989.57, 11,992.88 and 5,221.80

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Solution

The fourth proportional to 7,989.57, 11,992.88 and 5,221.80 is: 7,838.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,989.57 : 11,992.88 = 5,221.80 : x
  2. Step 2: Convert to fraction form
    7,989.57/11,992.88 = 5,221.80/x
  3. Step 3: Cross multiply
    7,989.57x = 11,992.88 × 5,221.80
  4. Step 4: Simplify right side
    7,989.57x = 62,624,420.78
  5. Step 5: Solve for x
    x = 62,624,420.78/7,989.57
  6. Step 6: Final answer
    x = 7,838.27

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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.