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Finding the Fourth Proportional to 20,685.89, 30,794.86 and 20,562.87

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Solution

The fourth proportional to 20,685.89, 30,794.86 and 20,562.87 is: 30,611.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,685.89 : 30,794.86 = 20,562.87 : x
  2. Step 2: Convert to fraction form
    20,685.89/30,794.86 = 20,562.87/x
  3. Step 3: Cross multiply
    20,685.89x = 30,794.86 × 20,562.87
  4. Step 4: Simplify right side
    20,685.89x = 633,230,702.85
  5. Step 5: Solve for x
    x = 633,230,702.85/20,685.89
  6. Step 6: Final answer
    x = 30,611.72

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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.