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Finding the Fourth Proportional to 5,321.72, 7,973.78 and 2,721.08

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Solution

The fourth proportional to 5,321.72, 7,973.78 and 2,721.08 is: 4,077.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,321.72 : 7,973.78 = 2,721.08 : x
  2. Step 2: Convert to fraction form
    5,321.72/7,973.78 = 2,721.08/x
  3. Step 3: Cross multiply
    5,321.72x = 7,973.78 × 2,721.08
  4. Step 4: Simplify right side
    5,321.72x = 21,697,293.28
  5. Step 5: Solve for x
    x = 21,697,293.28/5,321.72
  6. Step 6: Final answer
    x = 4,077.12

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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.