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Finding the Fourth Proportional to 391,932.31, 540,872.34 and 219,888.31

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Solution

The fourth proportional to 391,932.31, 540,872.34 and 219,888.31 is: 303,449.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,932.31 : 540,872.34 = 219,888.31 : x
  2. Step 2: Convert to fraction form
    391,932.31/540,872.34 = 219,888.31/x
  3. Step 3: Cross multiply
    391,932.31x = 540,872.34 × 219,888.31
  4. Step 4: Simplify right side
    391,932.31x = 118,931,504,768.35
  5. Step 5: Solve for x
    x = 118,931,504,768.35/391,932.31
  6. Step 6: Final answer
    x = 303,449.09

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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.