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Finding the Fourth Proportional to 4,736.78, 7,105.20 and 2,139.14

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Solution

The fourth proportional to 4,736.78, 7,105.20 and 2,139.14 is: 3,208.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,736.78 : 7,105.20 = 2,139.14 : x
  2. Step 2: Convert to fraction form
    4,736.78/7,105.20 = 2,139.14/x
  3. Step 3: Cross multiply
    4,736.78x = 7,105.20 × 2,139.14
  4. Step 4: Simplify right side
    4,736.78x = 15,199,017.53
  5. Step 5: Solve for x
    x = 15,199,017.53/4,736.78
  6. Step 6: Final answer
    x = 3,208.72

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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.