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Finding the Fourth Proportional to 8,615.47, 11,892.34 and 5,078.47

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Solution

The fourth proportional to 8,615.47, 11,892.34 and 5,078.47 is: 7,010.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,615.47 : 11,892.34 = 5,078.47 : x
  2. Step 2: Convert to fraction form
    8,615.47/11,892.34 = 5,078.47/x
  3. Step 3: Cross multiply
    8,615.47x = 11,892.34 × 5,078.47
  4. Step 4: Simplify right side
    8,615.47x = 60,394,891.92
  5. Step 5: Solve for x
    x = 60,394,891.92/8,615.47
  6. Step 6: Final answer
    x = 7,010.05

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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.