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Finding the Fourth Proportional to 15,012.73, 20,709.39 and 9,040.78

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Solution

The fourth proportional to 15,012.73, 20,709.39 and 9,040.78 is: 12,471.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,012.73 : 20,709.39 = 9,040.78 : x
  2. Step 2: Convert to fraction form
    15,012.73/20,709.39 = 9,040.78/x
  3. Step 3: Cross multiply
    15,012.73x = 20,709.39 × 9,040.78
  4. Step 4: Simplify right side
    15,012.73x = 187,229,038.92
  5. Step 5: Solve for x
    x = 187,229,038.92/15,012.73
  6. Step 6: Final answer
    x = 12,471.35

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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.