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Finding the Fourth Proportional to 7,073.21, 9,760.76 and 3,929.60

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Solution

The fourth proportional to 7,073.21, 9,760.76 and 3,929.60 is: 5,422.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,073.21 : 9,760.76 = 3,929.60 : x
  2. Step 2: Convert to fraction form
    7,073.21/9,760.76 = 3,929.60/x
  3. Step 3: Cross multiply
    7,073.21x = 9,760.76 × 3,929.60
  4. Step 4: Simplify right side
    7,073.21x = 38,355,862.85
  5. Step 5: Solve for x
    x = 38,355,862.85/7,073.21
  6. Step 6: Final answer
    x = 5,422.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.