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Finding the Fourth Proportional to 2,212.78, 3,319.92 and 980.02

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Solution

The fourth proportional to 2,212.78, 3,319.92 and 980.02 is: 1,470.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,212.78 : 3,319.92 = 980.02 : x
  2. Step 2: Convert to fraction form
    2,212.78/3,319.92 = 980.02/x
  3. Step 3: Cross multiply
    2,212.78x = 3,319.92 × 980.02
  4. Step 4: Simplify right side
    2,212.78x = 3,253,588.00
  5. Step 5: Solve for x
    x = 3,253,588.00/2,212.78
  6. Step 6: Final answer
    x = 1,470.36

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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.