Home / 8,220.65-12,319.61-7,122.29

Finding the Fourth Proportional to 8,220.65, 12,319.61 and 7,122.29

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Solution

The fourth proportional to 8,220.65, 12,319.61 and 7,122.29 is: 10,673.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,220.65 : 12,319.61 = 7,122.29 : x
  2. Step 2: Convert to fraction form
    8,220.65/12,319.61 = 7,122.29/x
  3. Step 3: Cross multiply
    8,220.65x = 12,319.61 × 7,122.29
  4. Step 4: Simplify right side
    8,220.65x = 87,743,737.90
  5. Step 5: Solve for x
    x = 87,743,737.90/8,220.65
  6. Step 6: Final answer
    x = 10,673.58

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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.