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Finding the Fourth Proportional to 2,720.88, 4,081.32 and 989.28

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Solution

The fourth proportional to 2,720.88, 4,081.32 and 989.28 is: 1,483.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,720.88 : 4,081.32 = 989.28 : x
  2. Step 2: Convert to fraction form
    2,720.88/4,081.32 = 989.28/x
  3. Step 3: Cross multiply
    2,720.88x = 4,081.32 × 989.28
  4. Step 4: Simplify right side
    2,720.88x = 4,037,568.25
  5. Step 5: Solve for x
    x = 4,037,568.25/2,720.88
  6. Step 6: Final answer
    x = 1,483.92

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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.