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Finding the Fourth Proportional to 18,791.78, 28,179.18 and 5,641.58

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Solution

The fourth proportional to 18,791.78, 28,179.18 and 5,641.58 is: 8,459.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,791.78 : 28,179.18 = 5,641.58 : x
  2. Step 2: Convert to fraction form
    18,791.78/28,179.18 = 5,641.58/x
  3. Step 3: Cross multiply
    18,791.78x = 28,179.18 × 5,641.58
  4. Step 4: Simplify right side
    18,791.78x = 158,975,098.30
  5. Step 5: Solve for x
    x = 158,975,098.30/18,791.78
  6. Step 6: Final answer
    x = 8,459.82

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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.