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Finding the Fourth Proportional to 7,139.79, 10,711.80 and 2,209.79

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Solution

The fourth proportional to 7,139.79, 10,711.80 and 2,209.79 is: 3,315.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,139.79 : 10,711.80 = 2,209.79 : x
  2. Step 2: Convert to fraction form
    7,139.79/10,711.80 = 2,209.79/x
  3. Step 3: Cross multiply
    7,139.79x = 10,711.80 × 2,209.79
  4. Step 4: Simplify right side
    7,139.79x = 23,670,774.96
  5. Step 5: Solve for x
    x = 23,670,774.96/7,139.79
  6. Step 6: Final answer
    x = 3,315.33

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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.