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Finding the Fourth Proportional to 31,658.99, 43,638.72 and 21,446.92

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Solution

The fourth proportional to 31,658.99, 43,638.72 and 21,446.92 is: 29,562.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,658.99 : 43,638.72 = 21,446.92 : x
  2. Step 2: Convert to fraction form
    31,658.99/43,638.72 = 21,446.92/x
  3. Step 3: Cross multiply
    31,658.99x = 43,638.72 × 21,446.92
  4. Step 4: Simplify right side
    31,658.99x = 935,915,974.03
  5. Step 5: Solve for x
    x = 935,915,974.03/31,658.99
  6. Step 6: Final answer
    x = 29,562.41

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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.