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Finding the Fourth Proportional to 128,010.11, 191,955.72 and 74,717.47

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Solution

The fourth proportional to 128,010.11, 191,955.72 and 74,717.47 is: 112,041.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,010.11 : 191,955.72 = 74,717.47 : x
  2. Step 2: Convert to fraction form
    128,010.11/191,955.72 = 74,717.47/x
  3. Step 3: Cross multiply
    128,010.11x = 191,955.72 × 74,717.47
  4. Step 4: Simplify right side
    128,010.11x = 14,342,446,270.56
  5. Step 5: Solve for x
    x = 14,342,446,270.56/128,010.11
  6. Step 6: Final answer
    x = 112,041.52

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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.