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Finding the Fourth Proportional to 6,486.72, 9,729.12 and 2,103.68

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Solution

The fourth proportional to 6,486.72, 9,729.12 and 2,103.68 is: 3,155.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,486.72 : 9,729.12 = 2,103.68 : x
  2. Step 2: Convert to fraction form
    6,486.72/9,729.12 = 2,103.68/x
  3. Step 3: Cross multiply
    6,486.72x = 9,729.12 × 2,103.68
  4. Step 4: Simplify right side
    6,486.72x = 20,466,955.16
  5. Step 5: Solve for x
    x = 20,466,955.16/6,486.72
  6. Step 6: Final answer
    x = 3,155.21

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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.