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Finding the Fourth Proportional to 128,072.78, 192,108.96 and 71,182.88

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Solution

The fourth proportional to 128,072.78, 192,108.96 and 71,182.88 is: 106,774.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,072.78 : 192,108.96 = 71,182.88 : x
  2. Step 2: Convert to fraction form
    128,072.78/192,108.96 = 71,182.88/x
  3. Step 3: Cross multiply
    128,072.78x = 192,108.96 × 71,182.88
  4. Step 4: Simplify right side
    128,072.78x = 13,674,869,046.60
  5. Step 5: Solve for x
    x = 13,674,869,046.60/128,072.78
  6. Step 6: Final answer
    x = 106,774.20

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1.5x scale

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.