Home / 12,115.89-18,181.11-5,190.39

Finding the Fourth Proportional to 12,115.89, 18,181.11 and 5,190.39

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Solution

The fourth proportional to 12,115.89, 18,181.11 and 5,190.39 is: 7,788.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,115.89 : 18,181.11 = 5,190.39 : x
  2. Step 2: Convert to fraction form
    12,115.89/18,181.11 = 5,190.39/x
  3. Step 3: Cross multiply
    12,115.89x = 18,181.11 × 5,190.39
  4. Step 4: Simplify right side
    12,115.89x = 94,367,051.53
  5. Step 5: Solve for x
    x = 94,367,051.53/12,115.89
  6. Step 6: Final answer
    x = 7,788.70

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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.