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Finding the Fourth Proportional to 99,992.88, 137,991.65 and 67,737.36

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Solution

The fourth proportional to 99,992.88, 137,991.65 and 67,737.36 is: 93,478.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,992.88 : 137,991.65 = 67,737.36 : x
  2. Step 2: Convert to fraction form
    99,992.88/137,991.65 = 67,737.36/x
  3. Step 3: Cross multiply
    99,992.88x = 137,991.65 × 67,737.36
  4. Step 4: Simplify right side
    99,992.88x = 9,347,190,632.85
  5. Step 5: Solve for x
    x = 9,347,190,632.85/99,992.88
  6. Step 6: Final answer
    x = 93,478.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.