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Finding the Fourth Proportional to 18,838.05, 28,261.80 and 8,310.08

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Solution

The fourth proportional to 18,838.05, 28,261.80 and 8,310.08 is: 12,467.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,838.05 : 28,261.80 = 8,310.08 : x
  2. Step 2: Convert to fraction form
    18,838.05/28,261.80 = 8,310.08/x
  3. Step 3: Cross multiply
    18,838.05x = 28,261.80 × 8,310.08
  4. Step 4: Simplify right side
    18,838.05x = 234,857,677.64
  5. Step 5: Solve for x
    x = 234,857,677.64/18,838.05
  6. Step 6: Final answer
    x = 12,467.20

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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.