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Finding the Fourth Proportional to 391,722.40, 587,635.89 and 155,009.72

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Solution

The fourth proportional to 391,722.40, 587,635.89 and 155,009.72 is: 232,535.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,722.40 : 587,635.89 = 155,009.72 : x
  2. Step 2: Convert to fraction form
    391,722.40/587,635.89 = 155,009.72/x
  3. Step 3: Cross multiply
    391,722.40x = 587,635.89 × 155,009.72
  4. Step 4: Simplify right side
    391,722.40x = 91,089,274,770.85
  5. Step 5: Solve for x
    x = 91,089,274,770.85/391,722.40
  6. Step 6: Final answer
    x = 232,535.27

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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.