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Finding the Fourth Proportional to 2,660.80, 3,991.20 and 929.04

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Solution

The fourth proportional to 2,660.80, 3,991.20 and 929.04 is: 1,393.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.80 : 3,991.20 = 929.04 : x
  2. Step 2: Convert to fraction form
    2,660.80/3,991.20 = 929.04/x
  3. Step 3: Cross multiply
    2,660.80x = 3,991.20 × 929.04
  4. Step 4: Simplify right side
    2,660.80x = 3,707,984.45
  5. Step 5: Solve for x
    x = 3,707,984.45/2,660.80
  6. Step 6: Final answer
    x = 1,393.56

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Similar ratio
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1.5x scale

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.