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Finding the Fourth Proportional to 72,680.80, 109,021.20 and 47,797.60

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Solution

The fourth proportional to 72,680.80, 109,021.20 and 47,797.60 is: 71,696.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,680.80 : 109,021.20 = 47,797.60 : x
  2. Step 2: Convert to fraction form
    72,680.80/109,021.20 = 47,797.60/x
  3. Step 3: Cross multiply
    72,680.80x = 109,021.20 × 47,797.60
  4. Step 4: Simplify right side
    72,680.80x = 5,210,951,709.12
  5. Step 5: Solve for x
    x = 5,210,951,709.12/72,680.80
  6. Step 6: Final answer
    x = 71,696.40

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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.