Home / 21,715.44-29,956.92-12,640.80

Finding the Fourth Proportional to 21,715.44, 29,956.92 and 12,640.80

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Solution

The fourth proportional to 21,715.44, 29,956.92 and 12,640.80 is: 17,438.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,715.44 : 29,956.92 = 12,640.80 : x
  2. Step 2: Convert to fraction form
    21,715.44/29,956.92 = 12,640.80/x
  3. Step 3: Cross multiply
    21,715.44x = 29,956.92 × 12,640.80
  4. Step 4: Simplify right side
    21,715.44x = 378,679,434.34
  5. Step 5: Solve for x
    x = 378,679,434.34/21,715.44
  6. Step 6: Final answer
    x = 17,438.26

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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.