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Finding the Fourth Proportional to 18,758.93, 28,138.80 and 5,611.82

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Solution

The fourth proportional to 18,758.93, 28,138.80 and 5,611.82 is: 8,417.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,758.93 : 28,138.80 = 5,611.82 : x
  2. Step 2: Convert to fraction form
    18,758.93/28,138.80 = 5,611.82/x
  3. Step 3: Cross multiply
    18,758.93x = 28,138.80 × 5,611.82
  4. Step 4: Simplify right side
    18,758.93x = 157,909,880.62
  5. Step 5: Solve for x
    x = 157,909,880.62/18,758.93
  6. Step 6: Final answer
    x = 8,417.85

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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.