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Finding the Fourth Proportional to 31,607, 43,611.92 and 20,422.52

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Solution

The fourth proportional to 31,607, 43,611.92 and 20,422.52 is: 28,179.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,607 : 43,611.92 = 20,422.52 : x
  2. Step 2: Convert to fraction form
    31,607/43,611.92 = 20,422.52/x
  3. Step 3: Cross multiply
    31,607x = 43,611.92 × 20,422.52
  4. Step 4: Simplify right side
    31,607x = 890,665,308.44
  5. Step 5: Solve for x
    x = 890,665,308.44/31,607
  6. Step 6: Final answer
    x = 28,179.37

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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.