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Finding the Fourth Proportional to 391,586.10, 587,379.15 and 125,355.30

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Solution

The fourth proportional to 391,586.10, 587,379.15 and 125,355.30 is: 188,032.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,586.10 : 587,379.15 = 125,355.30 : x
  2. Step 2: Convert to fraction form
    391,586.10/587,379.15 = 125,355.30/x
  3. Step 3: Cross multiply
    391,586.10x = 587,379.15 × 125,355.30
  4. Step 4: Simplify right side
    391,586.10x = 73,631,089,562.00
  5. Step 5: Solve for x
    x = 73,631,089,562.00/391,586.10
  6. Step 6: Final answer
    x = 188,032.95

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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.