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Finding the Fourth Proportional to 15,072.78, 20,801.70 and 8,785.56

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Solution

The fourth proportional to 15,072.78, 20,801.70 and 8,785.56 is: 12,124.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,072.78 : 20,801.70 = 8,785.56 : x
  2. Step 2: Convert to fraction form
    15,072.78/20,801.70 = 8,785.56/x
  3. Step 3: Cross multiply
    15,072.78x = 20,801.70 × 8,785.56
  4. Step 4: Simplify right side
    15,072.78x = 182,754,583.45
  5. Step 5: Solve for x
    x = 182,754,583.45/15,072.78
  6. Step 6: Final answer
    x = 12,124.81

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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.