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Finding the Fourth Proportional to 391,892.39, 540,832.90 and 219,864.85

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Solution

The fourth proportional to 391,892.39, 540,832.90 and 219,864.85 is: 303,425.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,892.39 : 540,832.90 = 219,864.85 : x
  2. Step 2: Convert to fraction form
    391,892.39/540,832.90 = 219,864.85/x
  3. Step 3: Cross multiply
    391,892.39x = 540,832.90 × 219,864.85
  4. Step 4: Simplify right side
    391,892.39x = 118,910,142,944.07
  5. Step 5: Solve for x
    x = 118,910,142,944.07/391,892.39
  6. Step 6: Final answer
    x = 303,425.49

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1.5x scale

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.