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Finding the Fourth Proportional to 30,453.80, 45,723.90 and 18,789.80

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Solution

The fourth proportional to 30,453.80, 45,723.90 and 18,789.80 is: 28,211.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,453.80 : 45,723.90 = 18,789.80 : x
  2. Step 2: Convert to fraction form
    30,453.80/45,723.90 = 18,789.80/x
  3. Step 3: Cross multiply
    30,453.80x = 45,723.90 × 18,789.80
  4. Step 4: Simplify right side
    30,453.80x = 859,142,936.22
  5. Step 5: Solve for x
    x = 859,142,936.22/30,453.80
  6. Step 6: Final answer
    x = 28,211.35

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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.