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Finding the Fourth Proportional to 391,855.37, 587,790.34 and 111,379.91

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Solution

The fourth proportional to 391,855.37, 587,790.34 and 111,379.91 is: 167,071.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,855.37 : 587,790.34 = 111,379.91 : x
  2. Step 2: Convert to fraction form
    391,855.37/587,790.34 = 111,379.91/x
  3. Step 3: Cross multiply
    391,855.37x = 587,790.34 × 111,379.91
  4. Step 4: Simplify right side
    391,855.37x = 65,468,031,950.67
  5. Step 5: Solve for x
    x = 65,468,031,950.67/391,855.37
  6. Step 6: Final answer
    x = 167,071.93

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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.