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Finding the Fourth Proportional to 18,451.05, 27,680.18 and 7,921.05

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Solution

The fourth proportional to 18,451.05, 27,680.18 and 7,921.05 is: 11,883.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,451.05 : 27,680.18 = 7,921.05 : x
  2. Step 2: Convert to fraction form
    18,451.05/27,680.18 = 7,921.05/x
  3. Step 3: Cross multiply
    18,451.05x = 27,680.18 × 7,921.05
  4. Step 4: Simplify right side
    18,451.05x = 219,256,050.18
  5. Step 5: Solve for x
    x = 219,256,050.18/18,451.05
  6. Step 6: Final answer
    x = 11,883.12

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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.