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Finding the Fourth Proportional to 15,439.80, 20,912.85 and 15,439.80

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Solution

The fourth proportional to 15,439.80, 20,912.85 and 15,439.80 is: 20,912.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,439.80 : 20,912.85 = 15,439.80 : x
  2. Step 2: Convert to fraction form
    15,439.80/20,912.85 = 15,439.80/x
  3. Step 3: Cross multiply
    15,439.80x = 20,912.85 × 15,439.80
  4. Step 4: Simplify right side
    15,439.80x = 322,890,221.43
  5. Step 5: Solve for x
    x = 322,890,221.43/15,439.80
  6. Step 6: Final answer
    x = 20,912.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.