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Finding the Fourth Proportional to 18,998.70, 28,530.45 and 12,453.90

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Solution

The fourth proportional to 18,998.70, 28,530.45 and 12,453.90 is: 18,702.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,998.70 : 28,530.45 = 12,453.90 : x
  2. Step 2: Convert to fraction form
    18,998.70/28,530.45 = 12,453.90/x
  3. Step 3: Cross multiply
    18,998.70x = 28,530.45 × 12,453.90
  4. Step 4: Simplify right side
    18,998.70x = 355,315,371.26
  5. Step 5: Solve for x
    x = 355,315,371.26/18,998.70
  6. Step 6: Final answer
    x = 18,702.09

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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.