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Finding the Fourth Proportional to 31,620.62, 43,641.11 and 19,687.70

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Solution

The fourth proportional to 31,620.62, 43,641.11 and 19,687.70 is: 27,171.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,620.62 : 43,641.11 = 19,687.70 : x
  2. Step 2: Convert to fraction form
    31,620.62/43,641.11 = 19,687.70/x
  3. Step 3: Cross multiply
    31,620.62x = 43,641.11 × 19,687.70
  4. Step 4: Simplify right side
    31,620.62x = 859,193,081.35
  5. Step 5: Solve for x
    x = 859,193,081.35/31,620.62
  6. Step 6: Final answer
    x = 27,171.92

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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.