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Finding the Fourth Proportional to 18,986.75, 28,490.40 and 7,901.09

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Solution

The fourth proportional to 18,986.75, 28,490.40 and 7,901.09 is: 11,855.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,986.75 : 28,490.40 = 7,901.09 : x
  2. Step 2: Convert to fraction form
    18,986.75/28,490.40 = 7,901.09/x
  3. Step 3: Cross multiply
    18,986.75x = 28,490.40 × 7,901.09
  4. Step 4: Simplify right side
    18,986.75x = 225,105,032.58
  5. Step 5: Solve for x
    x = 225,105,032.58/18,986.75
  6. Step 6: Final answer
    x = 11,855.90

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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.