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Finding the Fourth Proportional to 18,805.70, 28,212.12 and 7,561.91

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Solution

The fourth proportional to 18,805.70, 28,212.12 and 7,561.91 is: 11,344.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,805.70 : 28,212.12 = 7,561.91 : x
  2. Step 2: Convert to fraction form
    18,805.70/28,212.12 = 7,561.91/x
  3. Step 3: Cross multiply
    18,805.70x = 28,212.12 × 7,561.91
  4. Step 4: Simplify right side
    18,805.70x = 213,337,582.88
  5. Step 5: Solve for x
    x = 213,337,582.88/18,805.70
  6. Step 6: Final answer
    x = 11,344.30

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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.