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Finding the Fourth Proportional to 18,340.61, 27,511.99 and 5,191.88

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Solution

The fourth proportional to 18,340.61, 27,511.99 and 5,191.88 is: 7,788.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,340.61 : 27,511.99 = 5,191.88 : x
  2. Step 2: Convert to fraction form
    18,340.61/27,511.99 = 5,191.88/x
  3. Step 3: Cross multiply
    18,340.61x = 27,511.99 × 5,191.88
  4. Step 4: Simplify right side
    18,340.61x = 142,838,800.10
  5. Step 5: Solve for x
    x = 142,838,800.10/18,340.61
  6. Step 6: Final answer
    x = 7,788.12

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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.