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Finding the Fourth Proportional to 18,721.46, 28,057.94 and 7,615.16

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Solution

The fourth proportional to 18,721.46, 28,057.94 and 7,615.16 is: 11,412.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721.46 : 28,057.94 = 7,615.16 : x
  2. Step 2: Convert to fraction form
    18,721.46/28,057.94 = 7,615.16/x
  3. Step 3: Cross multiply
    18,721.46x = 28,057.94 × 7,615.16
  4. Step 4: Simplify right side
    18,721.46x = 213,665,581.12
  5. Step 5: Solve for x
    x = 213,665,581.12/18,721.46
  6. Step 6: Final answer
    x = 11,412.87

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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.