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Finding the Fourth Proportional to 272,138.80, 408,149.88 and 85,126

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Solution

The fourth proportional to 272,138.80, 408,149.88 and 85,126 is: 127,670.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    272,138.80 : 408,149.88 = 85,126 : x
  2. Step 2: Convert to fraction form
    272,138.80/408,149.88 = 85,126/x
  3. Step 3: Cross multiply
    272,138.80x = 408,149.88 × 85,126
  4. Step 4: Simplify right side
    272,138.80x = 34,744,166,684.88
  5. Step 5: Solve for x
    x = 34,744,166,684.88/272,138.80
  6. Step 6: Final answer
    x = 127,670.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.