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Finding the Fourth Proportional to 79,285.68, 118,928.88 and 20,121.30

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Solution

The fourth proportional to 79,285.68, 118,928.88 and 20,121.30 is: 30,182.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,285.68 : 118,928.88 = 20,121.30 : x
  2. Step 2: Convert to fraction form
    79,285.68/118,928.88 = 20,121.30/x
  3. Step 3: Cross multiply
    79,285.68x = 118,928.88 × 20,121.30
  4. Step 4: Simplify right side
    79,285.68x = 2,393,003,673.14
  5. Step 5: Solve for x
    x = 2,393,003,673.14/79,285.68
  6. Step 6: Final answer
    x = 30,182.04

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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.