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Finding the Fourth Proportional to 20,687.89, 30,797.84 and 20,564.87

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Solution

The fourth proportional to 20,687.89, 30,797.84 and 20,564.87 is: 30,614.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,687.89 : 30,797.84 = 20,564.87 : x
  2. Step 2: Convert to fraction form
    20,687.89/30,797.84 = 20,564.87/x
  3. Step 3: Cross multiply
    20,687.89x = 30,797.84 × 20,564.87
  4. Step 4: Simplify right side
    20,687.89x = 633,353,575.88
  5. Step 5: Solve for x
    x = 633,353,575.88/20,687.89
  6. Step 6: Final answer
    x = 30,614.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.