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Finding the Fourth Proportional to 122,108.78, 168,511.80 and 79,642.94

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Solution

The fourth proportional to 122,108.78, 168,511.80 and 79,642.94 is: 109,908.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,108.78 : 168,511.80 = 79,642.94 : x
  2. Step 2: Convert to fraction form
    122,108.78/168,511.80 = 79,642.94/x
  3. Step 3: Cross multiply
    122,108.78x = 168,511.80 × 79,642.94
  4. Step 4: Simplify right side
    122,108.78x = 13,420,775,176.69
  5. Step 5: Solve for x
    x = 13,420,775,176.69/122,108.78
  6. Step 6: Final answer
    x = 109,908.36

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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.