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Finding the Fourth Proportional to 18,122.61, 27,161.59 and 8,639.91

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Solution

The fourth proportional to 18,122.61, 27,161.59 and 8,639.91 is: 12,949.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,122.61 : 27,161.59 = 8,639.91 : x
  2. Step 2: Convert to fraction form
    18,122.61/27,161.59 = 8,639.91/x
  3. Step 3: Cross multiply
    18,122.61x = 27,161.59 × 8,639.91
  4. Step 4: Simplify right side
    18,122.61x = 234,673,693.06
  5. Step 5: Solve for x
    x = 234,673,693.06/18,122.61
  6. Step 6: Final answer
    x = 12,949.22

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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.