Home / 11,981.72-16,518.66-8,391.86

Finding the Fourth Proportional to 11,981.72, 16,518.66 and 8,391.86

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Solution

The fourth proportional to 11,981.72, 16,518.66 and 8,391.86 is: 11,569.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,981.72 : 16,518.66 = 8,391.86 : x
  2. Step 2: Convert to fraction form
    11,981.72/16,518.66 = 8,391.86/x
  3. Step 3: Cross multiply
    11,981.72x = 16,518.66 × 8,391.86
  4. Step 4: Simplify right side
    11,981.72x = 138,622,282.11
  5. Step 5: Solve for x
    x = 138,622,282.11/11,981.72
  6. Step 6: Final answer
    x = 11,569.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.