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Finding the Fourth Proportional to 12,115.58, 18,172.15 and 7,612.79

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Solution

The fourth proportional to 12,115.58, 18,172.15 and 7,612.79 is: 11,418.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,115.58 : 18,172.15 = 7,612.79 : x
  2. Step 2: Convert to fraction form
    12,115.58/18,172.15 = 7,612.79/x
  3. Step 3: Cross multiply
    12,115.58x = 18,172.15 × 7,612.79
  4. Step 4: Simplify right side
    12,115.58x = 138,340,651.91
  5. Step 5: Solve for x
    x = 138,340,651.91/12,115.58
  6. Step 6: Final answer
    x = 11,418.41

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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.