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Finding the Fourth Proportional to 99,129.67, 136,860.86 and 68,138.26

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Solution

The fourth proportional to 99,129.67, 136,860.86 and 68,138.26 is: 94,073.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,129.67 : 136,860.86 = 68,138.26 : x
  2. Step 2: Convert to fraction form
    99,129.67/136,860.86 = 68,138.26/x
  3. Step 3: Cross multiply
    99,129.67x = 136,860.86 × 68,138.26
  4. Step 4: Simplify right side
    99,129.67x = 9,325,460,690.70
  5. Step 5: Solve for x
    x = 9,325,460,690.70/99,129.67
  6. Step 6: Final answer
    x = 94,073.36

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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.