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Finding the Fourth Proportional to 72,605.92, 108,891.60 and 20,019.64

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Solution

The fourth proportional to 72,605.92, 108,891.60 and 20,019.64 is: 30,024.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,605.92 : 108,891.60 = 20,019.64 : x
  2. Step 2: Convert to fraction form
    72,605.92/108,891.60 = 20,019.64/x
  3. Step 3: Cross multiply
    72,605.92x = 108,891.60 × 20,019.64
  4. Step 4: Simplify right side
    72,605.92x = 2,179,970,631.02
  5. Step 5: Solve for x
    x = 2,179,970,631.02/72,605.92
  6. Step 6: Final answer
    x = 30,024.70

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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.