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Finding the Fourth Proportional to 29,290.80, 40,420.96 and 15,861.80

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Solution

The fourth proportional to 29,290.80, 40,420.96 and 15,861.80 is: 21,889.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,290.80 : 40,420.96 = 15,861.80 : x
  2. Step 2: Convert to fraction form
    29,290.80/40,420.96 = 15,861.80/x
  3. Step 3: Cross multiply
    29,290.80x = 40,420.96 × 15,861.80
  4. Step 4: Simplify right side
    29,290.80x = 641,149,183.33
  5. Step 5: Solve for x
    x = 641,149,183.33/29,290.80
  6. Step 6: Final answer
    x = 21,889.10

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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.