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Finding the Fourth Proportional to 31,640.56, 43,660.72 and 18,209.20

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Solution

The fourth proportional to 31,640.56, 43,660.72 and 18,209.20 is: 25,126.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,640.56 : 43,660.72 = 18,209.20 : x
  2. Step 2: Convert to fraction form
    31,640.56/43,660.72 = 18,209.20/x
  3. Step 3: Cross multiply
    31,640.56x = 43,660.72 × 18,209.20
  4. Step 4: Simplify right side
    31,640.56x = 795,026,782.62
  5. Step 5: Solve for x
    x = 795,026,782.62/31,640.56
  6. Step 6: Final answer
    x = 25,126.82

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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.