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Finding the Fourth Proportional to 128,482, 192,642 and 61,938.88

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Solution

The fourth proportional to 128,482, 192,642 and 61,938.88 is: 92,869.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,482 : 192,642 = 61,938.88 : x
  2. Step 2: Convert to fraction form
    128,482/192,642 = 61,938.88/x
  3. Step 3: Cross multiply
    128,482x = 192,642 × 61,938.88
  4. Step 4: Simplify right side
    128,482x = 11,932,029,720.96
  5. Step 5: Solve for x
    x = 11,932,029,720.96/128,482
  6. Step 6: Final answer
    x = 92,869.27

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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.