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Finding the Fourth Proportional to 261,242.88, 391,806.72 and 127,991.04

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Solution

The fourth proportional to 261,242.88, 391,806.72 and 127,991.04 is: 191,958.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,242.88 : 391,806.72 = 127,991.04 : x
  2. Step 2: Convert to fraction form
    261,242.88/391,806.72 = 127,991.04/x
  3. Step 3: Cross multiply
    261,242.88x = 391,806.72 × 127,991.04
  4. Step 4: Simplify right side
    261,242.88x = 50,147,749,571.79
  5. Step 5: Solve for x
    x = 50,147,749,571.79/261,242.88
  6. Step 6: Final answer
    x = 191,958.34

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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.