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Finding the Fourth Proportional to 8,615.90, 11,891.49 and 5,078.90

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Solution

The fourth proportional to 8,615.90, 11,891.49 and 5,078.90 is: 7,009.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,615.90 : 11,891.49 = 5,078.90 : x
  2. Step 2: Convert to fraction form
    8,615.90/11,891.49 = 5,078.90/x
  3. Step 3: Cross multiply
    8,615.90x = 11,891.49 × 5,078.90
  4. Step 4: Simplify right side
    8,615.90x = 60,395,688.56
  5. Step 5: Solve for x
    x = 60,395,688.56/8,615.90
  6. Step 6: Final answer
    x = 7,009.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.