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Finding the Fourth Proportional to 2,221.90, 3,113.90 and 2,221.90

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Solution

The fourth proportional to 2,221.90, 3,113.90 and 2,221.90 is: 3,113.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,221.90 : 3,113.90 = 2,221.90 : x
  2. Step 2: Convert to fraction form
    2,221.90/3,113.90 = 2,221.90/x
  3. Step 3: Cross multiply
    2,221.90x = 3,113.90 × 2,221.90
  4. Step 4: Simplify right side
    2,221.90x = 6,918,774.41
  5. Step 5: Solve for x
    x = 6,918,774.41/2,221.90
  6. Step 6: Final answer
    x = 3,113.90

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.