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Finding the Fourth Proportional to 69,928, 104,909.76 and 20,680

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Solution

The fourth proportional to 69,928, 104,909.76 and 20,680 is: 31,025.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,928 : 104,909.76 = 20,680 : x
  2. Step 2: Convert to fraction form
    69,928/104,909.76 = 20,680/x
  3. Step 3: Cross multiply
    69,928x = 104,909.76 × 20,680
  4. Step 4: Simplify right side
    69,928x = 2,169,533,836.80
  5. Step 5: Solve for x
    x = 2,169,533,836.80/69,928
  6. Step 6: Final answer
    x = 31,025.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.