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Finding the Fourth Proportional to 6,486.74, 9,721.90 and 4,145.84

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Solution

The fourth proportional to 6,486.74, 9,721.90 and 4,145.84 is: 6,213.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,486.74 : 9,721.90 = 4,145.84 : x
  2. Step 2: Convert to fraction form
    6,486.74/9,721.90 = 4,145.84/x
  3. Step 3: Cross multiply
    6,486.74x = 9,721.90 × 4,145.84
  4. Step 4: Simplify right side
    6,486.74x = 40,305,441.90
  5. Step 5: Solve for x
    x = 40,305,441.90/6,486.74
  6. Step 6: Final answer
    x = 6,213.51

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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.