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Finding the Fourth Proportional to 5,147.76, 7,721.28 and 1,449.84

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Solution

The fourth proportional to 5,147.76, 7,721.28 and 1,449.84 is: 2,174.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,147.76 : 7,721.28 = 1,449.84 : x
  2. Step 2: Convert to fraction form
    5,147.76/7,721.28 = 1,449.84/x
  3. Step 3: Cross multiply
    5,147.76x = 7,721.28 × 1,449.84
  4. Step 4: Simplify right side
    5,147.76x = 11,194,620.60
  5. Step 5: Solve for x
    x = 11,194,620.60/5,147.76
  6. Step 6: Final answer
    x = 2,174.66

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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.