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Finding the Fourth Proportional to 18,789.17, 28,183.95 and 7,688.12

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Solution

The fourth proportional to 18,789.17, 28,183.95 and 7,688.12 is: 11,532.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,789.17 : 28,183.95 = 7,688.12 : x
  2. Step 2: Convert to fraction form
    18,789.17/28,183.95 = 7,688.12/x
  3. Step 3: Cross multiply
    18,789.17x = 28,183.95 × 7,688.12
  4. Step 4: Simplify right side
    18,789.17x = 216,681,448.75
  5. Step 5: Solve for x
    x = 216,681,448.75/18,789.17
  6. Step 6: Final answer
    x = 11,532.26

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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.