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Finding the Fourth Proportional to 15,078.47, 20,806.80 and 8,618.18

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Solution

The fourth proportional to 15,078.47, 20,806.80 and 8,618.18 is: 11,892.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,078.47 : 20,806.80 = 8,618.18 : x
  2. Step 2: Convert to fraction form
    15,078.47/20,806.80 = 8,618.18/x
  3. Step 3: Cross multiply
    15,078.47x = 20,806.80 × 8,618.18
  4. Step 4: Simplify right side
    15,078.47x = 179,316,747.62
  5. Step 5: Solve for x
    x = 179,316,747.62/15,078.47
  6. Step 6: Final answer
    x = 11,892.24

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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.