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Finding the Fourth Proportional to 128,487.52, 192,770.72 and 57,469.91

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Solution

The fourth proportional to 128,487.52, 192,770.72 and 57,469.91 is: 86,222.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,487.52 : 192,770.72 = 57,469.91 : x
  2. Step 2: Convert to fraction form
    128,487.52/192,770.72 = 57,469.91/x
  3. Step 3: Cross multiply
    128,487.52x = 192,770.72 × 57,469.91
  4. Step 4: Simplify right side
    128,487.52x = 11,078,515,929.04
  5. Step 5: Solve for x
    x = 11,078,515,929.04/128,487.52
  6. Step 6: Final answer
    x = 86,222.51

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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.