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Finding the Fourth Proportional to 72,601.20, 108,901.80 and 20,010.60

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Solution

The fourth proportional to 72,601.20, 108,901.80 and 20,010.60 is: 30,015.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,601.20 : 108,901.80 = 20,010.60 : x
  2. Step 2: Convert to fraction form
    72,601.20/108,901.80 = 20,010.60/x
  3. Step 3: Cross multiply
    72,601.20x = 108,901.80 × 20,010.60
  4. Step 4: Simplify right side
    72,601.20x = 2,179,190,359.08
  5. Step 5: Solve for x
    x = 2,179,190,359.08/72,601.20
  6. Step 6: Final answer
    x = 30,015.90

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1.5x scale

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.