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Finding the Fourth Proportional to 4,679.67, 7,021.13 and 3,125.91

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Solution

The fourth proportional to 4,679.67, 7,021.13 and 3,125.91 is: 4,689.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,679.67 : 7,021.13 = 3,125.91 : x
  2. Step 2: Convert to fraction form
    4,679.67/7,021.13 = 3,125.91/x
  3. Step 3: Cross multiply
    4,679.67x = 7,021.13 × 3,125.91
  4. Step 4: Simplify right side
    4,679.67x = 21,947,404.85
  5. Step 5: Solve for x
    x = 21,947,404.85/4,679.67
  6. Step 6: Final answer
    x = 4,689.95

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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.