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Finding the Fourth Proportional to 99,998.73, 138,006.77 and 56,991.37

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Solution

The fourth proportional to 99,998.73, 138,006.77 and 56,991.37 is: 78,652.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,998.73 : 138,006.77 = 56,991.37 : x
  2. Step 2: Convert to fraction form
    99,998.73/138,006.77 = 56,991.37/x
  3. Step 3: Cross multiply
    99,998.73x = 138,006.77 × 56,991.37
  4. Step 4: Simplify right side
    99,998.73x = 7,865,194,891.57
  5. Step 5: Solve for x
    x = 7,865,194,891.57/99,998.73
  6. Step 6: Final answer
    x = 78,652.95

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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.