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Finding the Fourth Proportional to 15,165.31, 20,928.13 and 8,877.69

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Solution

The fourth proportional to 15,165.31, 20,928.13 and 8,877.69 is: 12,251.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,165.31 : 20,928.13 = 8,877.69 : x
  2. Step 2: Convert to fraction form
    15,165.31/20,928.13 = 8,877.69/x
  3. Step 3: Cross multiply
    15,165.31x = 20,928.13 × 8,877.69
  4. Step 4: Simplify right side
    15,165.31x = 185,793,450.42
  5. Step 5: Solve for x
    x = 185,793,450.42/15,165.31
  6. Step 6: Final answer
    x = 12,251.21

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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.