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Finding the Fourth Proportional to 15,157, 20,909.78 and 8,866.60

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Solution

The fourth proportional to 15,157, 20,909.78 and 8,866.60 is: 12,231.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,157 : 20,909.78 = 8,866.60 : x
  2. Step 2: Convert to fraction form
    15,157/20,909.78 = 8,866.60/x
  3. Step 3: Cross multiply
    15,157x = 20,909.78 × 8,866.60
  4. Step 4: Simplify right side
    15,157x = 185,398,655.35
  5. Step 5: Solve for x
    x = 185,398,655.35/15,157
  6. Step 6: Final answer
    x = 12,231.88

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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.