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Finding the Fourth Proportional to 18,865.28, 28,297.92 and 7,175.76

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Solution

The fourth proportional to 18,865.28, 28,297.92 and 7,175.76 is: 10,763.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,865.28 : 28,297.92 = 7,175.76 : x
  2. Step 2: Convert to fraction form
    18,865.28/28,297.92 = 7,175.76/x
  3. Step 3: Cross multiply
    18,865.28x = 28,297.92 × 7,175.76
  4. Step 4: Simplify right side
    18,865.28x = 203,059,082.42
  5. Step 5: Solve for x
    x = 203,059,082.42/18,865.28
  6. Step 6: Final answer
    x = 10,763.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.