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Finding the Fourth Proportional to 8,139.66, 12,211.32 and 2,945.52

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Solution

The fourth proportional to 8,139.66, 12,211.32 and 2,945.52 is: 4,418.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,139.66 : 12,211.32 = 2,945.52 : x
  2. Step 2: Convert to fraction form
    8,139.66/12,211.32 = 2,945.52/x
  3. Step 3: Cross multiply
    8,139.66x = 12,211.32 × 2,945.52
  4. Step 4: Simplify right side
    8,139.66x = 35,968,687.29
  5. Step 5: Solve for x
    x = 35,968,687.29/8,139.66
  6. Step 6: Final answer
    x = 4,418.94

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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.