Home / 3,985.40-5,499.96-2,217.20

Finding the Fourth Proportional to 3,985.40, 5,499.96 and 2,217.20

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Solution

The fourth proportional to 3,985.40, 5,499.96 and 2,217.20 is: 3,059.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,985.40 : 5,499.96 = 2,217.20 : x
  2. Step 2: Convert to fraction form
    3,985.40/5,499.96 = 2,217.20/x
  3. Step 3: Cross multiply
    3,985.40x = 5,499.96 × 2,217.20
  4. Step 4: Simplify right side
    3,985.40x = 12,194,511.31
  5. Step 5: Solve for x
    x = 12,194,511.31/3,985.40
  6. Step 6: Final answer
    x = 3,059.80

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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.