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Finding the Fourth Proportional to 2,652.60, 3,978.90 and 2,220.60

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Solution

The fourth proportional to 2,652.60, 3,978.90 and 2,220.60 is: 3,330.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,652.60 : 3,978.90 = 2,220.60 : x
  2. Step 2: Convert to fraction form
    2,652.60/3,978.90 = 2,220.60/x
  3. Step 3: Cross multiply
    2,652.60x = 3,978.90 × 2,220.60
  4. Step 4: Simplify right side
    2,652.60x = 8,835,545.34
  5. Step 5: Solve for x
    x = 8,835,545.34/2,652.60
  6. Step 6: Final answer
    x = 3,330.90

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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.