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Finding the Fourth Proportional to 2,660.28, 3,990.12 and 712.64

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Solution

The fourth proportional to 2,660.28, 3,990.12 and 712.64 is: 1,068.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.28 : 3,990.12 = 712.64 : x
  2. Step 2: Convert to fraction form
    2,660.28/3,990.12 = 712.64/x
  3. Step 3: Cross multiply
    2,660.28x = 3,990.12 × 712.64
  4. Step 4: Simplify right side
    2,660.28x = 2,843,519.12
  5. Step 5: Solve for x
    x = 2,843,519.12/2,660.28
  6. Step 6: Final answer
    x = 1,068.88

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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.