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Finding the Fourth Proportional to 5,679.78, 8,523.21 and 2,170.10

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Solution

The fourth proportional to 5,679.78, 8,523.21 and 2,170.10 is: 3,256.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,679.78 : 8,523.21 = 2,170.10 : x
  2. Step 2: Convert to fraction form
    5,679.78/8,523.21 = 2,170.10/x
  3. Step 3: Cross multiply
    5,679.78x = 8,523.21 × 2,170.10
  4. Step 4: Simplify right side
    5,679.78x = 18,496,164.55
  5. Step 5: Solve for x
    x = 18,496,164.55/5,679.78
  6. Step 6: Final answer
    x = 3,256.50

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Half scale
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Double scale
Find fourth proportional to 5,680.78, 8,524.71 and 2,171.10
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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.