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Finding the Fourth Proportional to 5,319.54, 7,980.39 and 2,721.78

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Solution

The fourth proportional to 5,319.54, 7,980.39 and 2,721.78 is: 4,083.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,319.54 : 7,980.39 = 2,721.78 : x
  2. Step 2: Convert to fraction form
    5,319.54/7,980.39 = 2,721.78/x
  3. Step 3: Cross multiply
    5,319.54x = 7,980.39 × 2,721.78
  4. Step 4: Simplify right side
    5,319.54x = 21,720,865.89
  5. Step 5: Solve for x
    x = 21,720,865.89/5,319.54
  6. Step 6: Final answer
    x = 4,083.22

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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.