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Finding the Fourth Proportional to 2,652.88, 3,979.92 and 921.50

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Solution

The fourth proportional to 2,652.88, 3,979.92 and 921.50 is: 1,382.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,652.88 : 3,979.92 = 921.50 : x
  2. Step 2: Convert to fraction form
    2,652.88/3,979.92 = 921.50/x
  3. Step 3: Cross multiply
    2,652.88x = 3,979.92 × 921.50
  4. Step 4: Simplify right side
    2,652.88x = 3,667,496.28
  5. Step 5: Solve for x
    x = 3,667,496.28/2,652.88
  6. Step 6: Final answer
    x = 1,382.46

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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.