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Finding the Fourth Proportional to 18,813.70, 28,220.55 and 16,999.30

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Solution

The fourth proportional to 18,813.70, 28,220.55 and 16,999.30 is: 25,498.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,813.70 : 28,220.55 = 16,999.30 : x
  2. Step 2: Convert to fraction form
    18,813.70/28,220.55 = 16,999.30/x
  3. Step 3: Cross multiply
    18,813.70x = 28,220.55 × 16,999.30
  4. Step 4: Simplify right side
    18,813.70x = 479,729,595.62
  5. Step 5: Solve for x
    x = 479,729,595.62/18,813.70
  6. Step 6: Final answer
    x = 25,498.95

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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.