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Finding the Fourth Proportional to 12,636.62, 18,939.56 and 8,939.91

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Solution

The fourth proportional to 12,636.62, 18,939.56 and 8,939.91 is: 13,398.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,636.62 : 18,939.56 = 8,939.91 : x
  2. Step 2: Convert to fraction form
    12,636.62/18,939.56 = 8,939.91/x
  3. Step 3: Cross multiply
    12,636.62x = 18,939.56 × 8,939.91
  4. Step 4: Simplify right side
    12,636.62x = 169,317,988.16
  5. Step 5: Solve for x
    x = 169,317,988.16/12,636.62
  6. Step 6: Final answer
    x = 13,398.99

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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.