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Finding the Fourth Proportional to 18,665.64, 27,981.18 and 6,345

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Solution

The fourth proportional to 18,665.64, 27,981.18 and 6,345 is: 9,511.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,665.64 : 27,981.18 = 6,345 : x
  2. Step 2: Convert to fraction form
    18,665.64/27,981.18 = 6,345/x
  3. Step 3: Cross multiply
    18,665.64x = 27,981.18 × 6,345
  4. Step 4: Simplify right side
    18,665.64x = 177,540,587.10
  5. Step 5: Solve for x
    x = 177,540,587.10/18,665.64
  6. Step 6: Final answer
    x = 9,511.63

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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.