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Finding the Fourth Proportional to 122,390.62, 168,901.67 and 68,679.52

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Solution

The fourth proportional to 122,390.62, 168,901.67 and 68,679.52 is: 94,779.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,390.62 : 168,901.67 = 68,679.52 : x
  2. Step 2: Convert to fraction form
    122,390.62/168,901.67 = 68,679.52/x
  3. Step 3: Cross multiply
    122,390.62x = 168,901.67 × 68,679.52
  4. Step 4: Simplify right side
    122,390.62x = 11,600,085,622.80
  5. Step 5: Solve for x
    x = 11,600,085,622.80/122,390.62
  6. Step 6: Final answer
    x = 94,779.20

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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.