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Finding the Fourth Proportional to 99,790.43, 137,710.76 and 68,014.82

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Solution

The fourth proportional to 99,790.43, 137,710.76 and 68,014.82 is: 93,860.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,790.43 : 137,710.76 = 68,014.82 : x
  2. Step 2: Convert to fraction form
    99,790.43/137,710.76 = 68,014.82/x
  3. Step 3: Cross multiply
    99,790.43x = 137,710.76 × 68,014.82
  4. Step 4: Simplify right side
    99,790.43x = 9,366,371,524.84
  5. Step 5: Solve for x
    x = 9,366,371,524.84/99,790.43
  6. Step 6: Final answer
    x = 93,860.42

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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.