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Finding the Fourth Proportional to 18,936.28, 28,404.42 and 5,085.28

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Solution

The fourth proportional to 18,936.28, 28,404.42 and 5,085.28 is: 7,627.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,936.28 : 28,404.42 = 5,085.28 : x
  2. Step 2: Convert to fraction form
    18,936.28/28,404.42 = 5,085.28/x
  3. Step 3: Cross multiply
    18,936.28x = 28,404.42 × 5,085.28
  4. Step 4: Simplify right side
    18,936.28x = 144,444,473.98
  5. Step 5: Solve for x
    x = 144,444,473.98/18,936.28
  6. Step 6: Final answer
    x = 7,627.92

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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.