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Finding the Fourth Proportional to 391,027.85, 539,573.79 and 218,921.88

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Solution

The fourth proportional to 391,027.85, 539,573.79 and 218,921.88 is: 302,087.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,027.85 : 539,573.79 = 218,921.88 : x
  2. Step 2: Convert to fraction form
    391,027.85/539,573.79 = 218,921.88/x
  3. Step 3: Cross multiply
    391,027.85x = 539,573.79 × 218,921.88
  4. Step 4: Simplify right side
    391,027.85x = 118,124,508,505.53
  5. Step 5: Solve for x
    x = 118,124,508,505.53/391,027.85
  6. Step 6: Final answer
    x = 302,087.20

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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.