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Finding the Fourth Proportional to 15,003.88, 20,709.38 and 8,631.20

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Solution

The fourth proportional to 15,003.88, 20,709.38 and 8,631.20 is: 11,913.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,003.88 : 20,709.38 = 8,631.20 : x
  2. Step 2: Convert to fraction form
    15,003.88/20,709.38 = 8,631.20/x
  3. Step 3: Cross multiply
    15,003.88x = 20,709.38 × 8,631.20
  4. Step 4: Simplify right side
    15,003.88x = 178,746,800.66
  5. Step 5: Solve for x
    x = 178,746,800.66/15,003.88
  6. Step 6: Final answer
    x = 11,913.37

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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.