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Finding the Fourth Proportional to 71,976.80, 108,013.80 and 40,386.80

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Solution

The fourth proportional to 71,976.80, 108,013.80 and 40,386.80 is: 60,607.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,976.80 : 108,013.80 = 40,386.80 : x
  2. Step 2: Convert to fraction form
    71,976.80/108,013.80 = 40,386.80/x
  3. Step 3: Cross multiply
    71,976.80x = 108,013.80 × 40,386.80
  4. Step 4: Simplify right side
    71,976.80x = 4,362,331,737.84
  5. Step 5: Solve for x
    x = 4,362,331,737.84/71,976.80
  6. Step 6: Final answer
    x = 60,607.47

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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.