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Finding the Fourth Proportional to 391,902.75, 587,884.50 and 121,996.98

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Solution

The fourth proportional to 391,902.75, 587,884.50 and 121,996.98 is: 183,004.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,902.75 : 587,884.50 = 121,996.98 : x
  2. Step 2: Convert to fraction form
    391,902.75/587,884.50 = 121,996.98/x
  3. Step 3: Cross multiply
    391,902.75x = 587,884.50 × 121,996.98
  4. Step 4: Simplify right side
    391,902.75x = 71,720,133,588.81
  5. Step 5: Solve for x
    x = 71,720,133,588.81/391,902.75
  6. Step 6: Final answer
    x = 183,004.93

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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.