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Finding the Fourth Proportional to 7,900.15, 11,850.15 and 3,219.06

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Solution

The fourth proportional to 7,900.15, 11,850.15 and 3,219.06 is: 4,828.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,900.15 : 11,850.15 = 3,219.06 : x
  2. Step 2: Convert to fraction form
    7,900.15/11,850.15 = 3,219.06/x
  3. Step 3: Cross multiply
    7,900.15x = 11,850.15 × 3,219.06
  4. Step 4: Simplify right side
    7,900.15x = 38,146,315.60
  5. Step 5: Solve for x
    x = 38,146,315.60/7,900.15
  6. Step 6: Final answer
    x = 4,828.56

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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.