Home / 21,132.72-29,168.97-12,640.68

Finding the Fourth Proportional to 21,132.72, 29,168.97 and 12,640.68

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Solution

The fourth proportional to 21,132.72, 29,168.97 and 12,640.68 is: 17,447.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,132.72 : 29,168.97 = 12,640.68 : x
  2. Step 2: Convert to fraction form
    21,132.72/29,168.97 = 12,640.68/x
  3. Step 3: Cross multiply
    21,132.72x = 29,168.97 × 12,640.68
  4. Step 4: Simplify right side
    21,132.72x = 368,715,615.70
  5. Step 5: Solve for x
    x = 368,715,615.70/21,132.72
  6. Step 6: Final answer
    x = 17,447.62

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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.