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Finding the Fourth Proportional to 15,082.80, 20,815.25 and 8,709.66

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Solution

The fourth proportional to 15,082.80, 20,815.25 and 8,709.66 is: 12,019.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,082.80 : 20,815.25 = 8,709.66 : x
  2. Step 2: Convert to fraction form
    15,082.80/20,815.25 = 8,709.66/x
  3. Step 3: Cross multiply
    15,082.80x = 20,815.25 × 8,709.66
  4. Step 4: Simplify right side
    15,082.80x = 181,293,750.32
  5. Step 5: Solve for x
    x = 181,293,750.32/15,082.80
  6. Step 6: Final answer
    x = 12,019.90

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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.