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Finding the Fourth Proportional to 8,139.69, 11,220.53 and 6,368.22

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Solution

The fourth proportional to 8,139.69, 11,220.53 and 6,368.22 is: 8,778.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,139.69 : 11,220.53 = 6,368.22 : x
  2. Step 2: Convert to fraction form
    8,139.69/11,220.53 = 6,368.22/x
  3. Step 3: Cross multiply
    8,139.69x = 11,220.53 × 6,368.22
  4. Step 4: Simplify right side
    8,139.69x = 71,454,771.72
  5. Step 5: Solve for x
    x = 71,454,771.72/8,139.69
  6. Step 6: Final answer
    x = 8,778.56

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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.