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Finding the Fourth Proportional to 7,138.60, 10,708.70 and 2,208.20

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Solution

The fourth proportional to 7,138.60, 10,708.70 and 2,208.20 is: 3,312.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,138.60 : 10,708.70 = 2,208.20 : x
  2. Step 2: Convert to fraction form
    7,138.60/10,708.70 = 2,208.20/x
  3. Step 3: Cross multiply
    7,138.60x = 10,708.70 × 2,208.20
  4. Step 4: Simplify right side
    7,138.60x = 23,646,951.34
  5. Step 5: Solve for x
    x = 23,646,951.34/7,138.60
  6. Step 6: Final answer
    x = 3,312.55

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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.