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Finding the Fourth Proportional to 99,788.34, 137,707.92 and 68,012.75

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Solution

The fourth proportional to 99,788.34, 137,707.92 and 68,012.75 is: 93,857.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,788.34 : 137,707.92 = 68,012.75 : x
  2. Step 2: Convert to fraction form
    99,788.34/137,707.92 = 68,012.75/x
  3. Step 3: Cross multiply
    99,788.34x = 137,707.92 × 68,012.75
  4. Step 4: Simplify right side
    99,788.34x = 9,365,894,680.25
  5. Step 5: Solve for x
    x = 9,365,894,680.25/99,788.34
  6. Step 6: Final answer
    x = 93,857.60

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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.