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Finding the Fourth Proportional to 12,605.22, 18,910.95 and 5,211.80

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Solution

The fourth proportional to 12,605.22, 18,910.95 and 5,211.80 is: 7,818.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,605.22 : 18,910.95 = 5,211.80 : x
  2. Step 2: Convert to fraction form
    12,605.22/18,910.95 = 5,211.80/x
  3. Step 3: Cross multiply
    12,605.22x = 18,910.95 × 5,211.80
  4. Step 4: Simplify right side
    12,605.22x = 98,560,089.21
  5. Step 5: Solve for x
    x = 98,560,089.21/12,605.22
  6. Step 6: Final answer
    x = 7,818.99

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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.