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Finding the Fourth Proportional to 391,802.72, 587,704.19 and 258,651.81

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Solution

The fourth proportional to 391,802.72, 587,704.19 and 258,651.81 is: 387,977.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,802.72 : 587,704.19 = 258,651.81 : x
  2. Step 2: Convert to fraction form
    391,802.72/587,704.19 = 258,651.81/x
  3. Step 3: Cross multiply
    391,802.72x = 587,704.19 × 258,651.81
  4. Step 4: Simplify right side
    391,802.72x = 152,010,751,194.83
  5. Step 5: Solve for x
    x = 152,010,751,194.83/391,802.72
  6. Step 6: Final answer
    x = 387,977.79

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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.