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Finding the Fourth Proportional to 15,000.65, 20,700.92 and 8,286.65

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Solution

The fourth proportional to 15,000.65, 20,700.92 and 8,286.65 is: 11,435.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,000.65 : 20,700.92 = 8,286.65 : x
  2. Step 2: Convert to fraction form
    15,000.65/20,700.92 = 8,286.65/x
  3. Step 3: Cross multiply
    15,000.65x = 20,700.92 × 8,286.65
  4. Step 4: Simplify right side
    15,000.65x = 171,541,237.28
  5. Step 5: Solve for x
    x = 171,541,237.28/15,000.65
  6. Step 6: Final answer
    x = 11,435.59

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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.