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Finding the Fourth Proportional to 99,789.67, 137,709.72 and 68,014.07

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Solution

The fourth proportional to 99,789.67, 137,709.72 and 68,014.07 is: 93,859.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,789.67 : 137,709.72 = 68,014.07 : x
  2. Step 2: Convert to fraction form
    99,789.67/137,709.72 = 68,014.07/x
  3. Step 3: Cross multiply
    99,789.67x = 137,709.72 × 68,014.07
  4. Step 4: Simplify right side
    99,789.67x = 9,366,197,847.21
  5. Step 5: Solve for x
    x = 9,366,197,847.21/99,789.67
  6. Step 6: Final answer
    x = 93,859.40

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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.