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Finding the Fourth Proportional to 18,900.72, 28,338.93 and 7,207.56

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Solution

The fourth proportional to 18,900.72, 28,338.93 and 7,207.56 is: 10,806.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,900.72 : 28,338.93 = 7,207.56 : x
  2. Step 2: Convert to fraction form
    18,900.72/28,338.93 = 7,207.56/x
  3. Step 3: Cross multiply
    18,900.72x = 28,338.93 × 7,207.56
  4. Step 4: Simplify right side
    18,900.72x = 204,254,538.31
  5. Step 5: Solve for x
    x = 204,254,538.31/18,900.72
  6. Step 6: Final answer
    x = 10,806.71

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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.