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Finding the Fourth Proportional to 31,679.92, 43,713.95 and 18,930.41

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Solution

The fourth proportional to 31,679.92, 43,713.95 and 18,930.41 is: 26,121.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,679.92 : 43,713.95 = 18,930.41 : x
  2. Step 2: Convert to fraction form
    31,679.92/43,713.95 = 18,930.41/x
  3. Step 3: Cross multiply
    31,679.92x = 43,713.95 × 18,930.41
  4. Step 4: Simplify right side
    31,679.92x = 827,523,152.83
  5. Step 5: Solve for x
    x = 827,523,152.83/31,679.92
  6. Step 6: Final answer
    x = 26,121.38

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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.