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Finding the Fourth Proportional to 15,173.72, 20,939.84 and 8,459.78

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Solution

The fourth proportional to 15,173.72, 20,939.84 and 8,459.78 is: 11,674.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,173.72 : 20,939.84 = 8,459.78 : x
  2. Step 2: Convert to fraction form
    15,173.72/20,939.84 = 8,459.78/x
  3. Step 3: Cross multiply
    15,173.72x = 20,939.84 × 8,459.78
  4. Step 4: Simplify right side
    15,173.72x = 177,146,439.64
  5. Step 5: Solve for x
    x = 177,146,439.64/15,173.72
  6. Step 6: Final answer
    x = 11,674.56

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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.