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Finding the Fourth Proportional to 2,661.28, 3,992.39 and 906.20

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Solution

The fourth proportional to 2,661.28, 3,992.39 and 906.20 is: 1,359.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,661.28 : 3,992.39 = 906.20 : x
  2. Step 2: Convert to fraction form
    2,661.28/3,992.39 = 906.20/x
  3. Step 3: Cross multiply
    2,661.28x = 3,992.39 × 906.20
  4. Step 4: Simplify right side
    2,661.28x = 3,617,886.12
  5. Step 5: Solve for x
    x = 3,617,886.12/2,661.28
  6. Step 6: Final answer
    x = 1,359.45

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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.