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Finding the Fourth Proportional to 4,486.78, 6,721.53 and 2,179.90

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Solution

The fourth proportional to 4,486.78, 6,721.53 and 2,179.90 is: 3,265.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,486.78 : 6,721.53 = 2,179.90 : x
  2. Step 2: Convert to fraction form
    4,486.78/6,721.53 = 2,179.90/x
  3. Step 3: Cross multiply
    4,486.78x = 6,721.53 × 2,179.90
  4. Step 4: Simplify right side
    4,486.78x = 14,652,263.25
  5. Step 5: Solve for x
    x = 14,652,263.25/4,486.78
  6. Step 6: Final answer
    x = 3,265.65

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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.