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Finding the Fourth Proportional to 235,991.43, 325,666.89 and 128,561.20

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Solution

The fourth proportional to 235,991.43, 325,666.89 and 128,561.20 is: 177,413.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    235,991.43 : 325,666.89 = 128,561.20 : x
  2. Step 2: Convert to fraction form
    235,991.43/325,666.89 = 128,561.20/x
  3. Step 3: Cross multiply
    235,991.43x = 325,666.89 × 128,561.20
  4. Step 4: Simplify right side
    235,991.43x = 41,868,126,178.67
  5. Step 5: Solve for x
    x = 41,868,126,178.67/235,991.43
  6. Step 6: Final answer
    x = 177,413.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.