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Finding the Fourth Proportional to 7,078.74, 10,608.03 and 5,215.20

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Solution

The fourth proportional to 7,078.74, 10,608.03 and 5,215.20 is: 7,815.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,078.74 : 10,608.03 = 5,215.20 : x
  2. Step 2: Convert to fraction form
    7,078.74/10,608.03 = 5,215.20/x
  3. Step 3: Cross multiply
    7,078.74x = 10,608.03 × 5,215.20
  4. Step 4: Simplify right side
    7,078.74x = 55,322,958.28
  5. Step 5: Solve for x
    x = 55,322,958.28/7,078.74
  6. Step 6: Final answer
    x = 7,815.37

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1.5x scale

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.