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Finding the Fourth Proportional to 2,489.20, 3,731.30 and 928.20

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Solution

The fourth proportional to 2,489.20, 3,731.30 and 928.20 is: 1,391.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,489.20 : 3,731.30 = 928.20 : x
  2. Step 2: Convert to fraction form
    2,489.20/3,731.30 = 928.20/x
  3. Step 3: Cross multiply
    2,489.20x = 3,731.30 × 928.20
  4. Step 4: Simplify right side
    2,489.20x = 3,463,392.66
  5. Step 5: Solve for x
    x = 3,463,392.66/2,489.20
  6. Step 6: Final answer
    x = 1,391.37

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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.