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Finding the Fourth Proportional to 12,139.92, 18,211.92 and 5,911.02

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Solution

The fourth proportional to 12,139.92, 18,211.92 and 5,911.02 is: 8,867.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,139.92 : 18,211.92 = 5,911.02 : x
  2. Step 2: Convert to fraction form
    12,139.92/18,211.92 = 5,911.02/x
  3. Step 3: Cross multiply
    12,139.92x = 18,211.92 × 5,911.02
  4. Step 4: Simplify right side
    12,139.92x = 107,651,023.36
  5. Step 5: Solve for x
    x = 107,651,023.36/12,139.92
  6. Step 6: Final answer
    x = 8,867.52

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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.