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Finding the Fourth Proportional to 128,021.92, 191,877.32 and 90,592.97

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Solution

The fourth proportional to 128,021.92, 191,877.32 and 90,592.97 is: 135,779.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,021.92 : 191,877.32 = 90,592.97 : x
  2. Step 2: Convert to fraction form
    128,021.92/191,877.32 = 90,592.97/x
  3. Step 3: Cross multiply
    128,021.92x = 191,877.32 × 90,592.97
  4. Step 4: Simplify right side
    128,021.92x = 17,382,735,561.54
  5. Step 5: Solve for x
    x = 17,382,735,561.54/128,021.92
  6. Step 6: Final answer
    x = 135,779.37

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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.