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Finding the Fourth Proportional to 15,600.96, 21,540.60 and 9,640.80

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Solution

The fourth proportional to 15,600.96, 21,540.60 and 9,640.80 is: 13,311.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,600.96 : 21,540.60 = 9,640.80 : x
  2. Step 2: Convert to fraction form
    15,600.96/21,540.60 = 9,640.80/x
  3. Step 3: Cross multiply
    15,600.96x = 21,540.60 × 9,640.80
  4. Step 4: Simplify right side
    15,600.96x = 207,668,616.48
  5. Step 5: Solve for x
    x = 207,668,616.48/15,600.96
  6. Step 6: Final answer
    x = 13,311.27

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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.