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Finding the Fourth Proportional to 99,791.34, 137,712.06 and 68,015.76

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Solution

The fourth proportional to 99,791.34, 137,712.06 and 68,015.76 is: 93,861.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,791.34 : 137,712.06 = 68,015.76 : x
  2. Step 2: Convert to fraction form
    99,791.34/137,712.06 = 68,015.76/x
  3. Step 3: Cross multiply
    99,791.34x = 137,712.06 × 68,015.76
  4. Step 4: Simplify right side
    99,791.34x = 9,366,590,422.07
  5. Step 5: Solve for x
    x = 9,366,590,422.07/99,791.34
  6. Step 6: Final answer
    x = 93,861.76

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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.