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Finding the Fourth Proportional to 122,340.78, 168,745.28 and 99,679.82

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Solution

The fourth proportional to 122,340.78, 168,745.28 and 99,679.82 is: 137,488.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,340.78 : 168,745.28 = 99,679.82 : x
  2. Step 2: Convert to fraction form
    122,340.78/168,745.28 = 99,679.82/x
  3. Step 3: Cross multiply
    122,340.78x = 168,745.28 × 99,679.82
  4. Step 4: Simplify right side
    122,340.78x = 16,820,497,794.12
  5. Step 5: Solve for x
    x = 16,820,497,794.12/122,340.78
  6. Step 6: Final answer
    x = 137,488.89

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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.