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Finding the Fourth Proportional to 1,980.87, 2,972.49 and 748.26

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Solution

The fourth proportional to 1,980.87, 2,972.49 and 748.26 is: 1,122.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.87 : 2,972.49 = 748.26 : x
  2. Step 2: Convert to fraction form
    1,980.87/2,972.49 = 748.26/x
  3. Step 3: Cross multiply
    1,980.87x = 2,972.49 × 748.26
  4. Step 4: Simplify right side
    1,980.87x = 2,224,195.37
  5. Step 5: Solve for x
    x = 2,224,195.37/1,980.87
  6. Step 6: Final answer
    x = 1,122.84

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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.