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Finding the Fourth Proportional to 1,980.91, 2,971.33 and 748.09

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Solution

The fourth proportional to 1,980.91, 2,971.33 and 748.09 is: 1,122.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.91 : 2,971.33 = 748.09 : x
  2. Step 2: Convert to fraction form
    1,980.91/2,971.33 = 748.09/x
  3. Step 3: Cross multiply
    1,980.91x = 2,971.33 × 748.09
  4. Step 4: Simplify right side
    1,980.91x = 2,222,811.60
  5. Step 5: Solve for x
    x = 2,222,811.60/1,980.91
  6. Step 6: Final answer
    x = 1,122.12

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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.