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Finding the Fourth Proportional to 122,311.72, 168,772.90 and 71,339.88

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Solution

The fourth proportional to 122,311.72, 168,772.90 and 71,339.88 is: 98,438.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,311.72 : 168,772.90 = 71,339.88 : x
  2. Step 2: Convert to fraction form
    122,311.72/168,772.90 = 71,339.88/x
  3. Step 3: Cross multiply
    122,311.72x = 168,772.90 × 71,339.88
  4. Step 4: Simplify right side
    122,311.72x = 12,040,238,433.25
  5. Step 5: Solve for x
    x = 12,040,238,433.25/122,311.72
  6. Step 6: Final answer
    x = 98,438.96

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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.