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Finding the Fourth Proportional to 391,023.88, 539,568.34 and 218,917.91

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Solution

The fourth proportional to 391,023.88, 539,568.34 and 218,917.91 is: 302,081.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,023.88 : 539,568.34 = 218,917.91 : x
  2. Step 2: Convert to fraction form
    391,023.88/539,568.34 = 218,917.91/x
  3. Step 3: Cross multiply
    391,023.88x = 539,568.34 × 218,917.91
  4. Step 4: Simplify right side
    391,023.88x = 118,121,174,096.60
  5. Step 5: Solve for x
    x = 118,121,174,096.60/391,023.88
  6. Step 6: Final answer
    x = 302,081.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.