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Finding the Fourth Proportional to 3,985.64, 5,500.12 and 2,217.21

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Solution

The fourth proportional to 3,985.64, 5,500.12 and 2,217.21 is: 3,059.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,985.64 : 5,500.12 = 2,217.21 : x
  2. Step 2: Convert to fraction form
    3,985.64/5,500.12 = 2,217.21/x
  3. Step 3: Cross multiply
    3,985.64x = 5,500.12 × 2,217.21
  4. Step 4: Simplify right side
    3,985.64x = 12,194,915.52
  5. Step 5: Solve for x
    x = 12,194,915.52/3,985.64
  6. Step 6: Final answer
    x = 3,059.71

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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.