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Finding the Fourth Proportional to 2,920.32, 4,380.48 and 1,939.41

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Solution

The fourth proportional to 2,920.32, 4,380.48 and 1,939.41 is: 2,909.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,920.32 : 4,380.48 = 1,939.41 : x
  2. Step 2: Convert to fraction form
    2,920.32/4,380.48 = 1,939.41/x
  3. Step 3: Cross multiply
    2,920.32x = 4,380.48 × 1,939.41
  4. Step 4: Simplify right side
    2,920.32x = 8,495,546.72
  5. Step 5: Solve for x
    x = 8,495,546.72/2,920.32
  6. Step 6: Final answer
    x = 2,909.12

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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.