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Finding the Fourth Proportional to 72,049.40, 108,009.30 and 45,740.60

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Solution

The fourth proportional to 72,049.40, 108,009.30 and 45,740.60 is: 68,569.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,049.40 : 108,009.30 = 45,740.60 : x
  2. Step 2: Convert to fraction form
    72,049.40/108,009.30 = 45,740.60/x
  3. Step 3: Cross multiply
    72,049.40x = 108,009.30 × 45,740.60
  4. Step 4: Simplify right side
    72,049.40x = 4,940,410,187.58
  5. Step 5: Solve for x
    x = 4,940,410,187.58/72,049.40
  6. Step 6: Final answer
    x = 68,569.76

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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.