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Finding the Fourth Proportional to 72,012.80, 108,067.80 and 40,422.80

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Solution

The fourth proportional to 72,012.80, 108,067.80 and 40,422.80 is: 60,661.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,012.80 : 108,067.80 = 40,422.80 : x
  2. Step 2: Convert to fraction form
    72,012.80/108,067.80 = 40,422.80/x
  3. Step 3: Cross multiply
    72,012.80x = 108,067.80 × 40,422.80
  4. Step 4: Simplify right side
    72,012.80x = 4,368,403,065.84
  5. Step 5: Solve for x
    x = 4,368,403,065.84/72,012.80
  6. Step 6: Final answer
    x = 60,661.48

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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.