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Finding the Fourth Proportional to 128,010.61, 191,956.48 and 74,717.97

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Solution

The fourth proportional to 128,010.61, 191,956.48 and 74,717.97 is: 112,042.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,010.61 : 191,956.48 = 74,717.97 : x
  2. Step 2: Convert to fraction form
    128,010.61/191,956.48 = 74,717.97/x
  3. Step 3: Cross multiply
    128,010.61x = 191,956.48 × 74,717.97
  4. Step 4: Simplify right side
    128,010.61x = 14,342,598,140.36
  5. Step 5: Solve for x
    x = 14,342,598,140.36/128,010.61
  6. Step 6: Final answer
    x = 112,042.27

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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.