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Finding the Fourth Proportional to 6,220.78, 8,584.51 and 3,388.21

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Solution

The fourth proportional to 6,220.78, 8,584.51 and 3,388.21 is: 4,675.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,220.78 : 8,584.51 = 3,388.21 : x
  2. Step 2: Convert to fraction form
    6,220.78/8,584.51 = 3,388.21/x
  3. Step 3: Cross multiply
    6,220.78x = 8,584.51 × 3,388.21
  4. Step 4: Simplify right side
    6,220.78x = 29,086,122.63
  5. Step 5: Solve for x
    x = 29,086,122.63/6,220.78
  6. Step 6: Final answer
    x = 4,675.64

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Half scale
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Double scale
Find fourth proportional to 6,221.78, 8,585.89 and 3,389.21
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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.