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Finding the Fourth Proportional to 391,729.64, 540,387.90 and 255,843.18

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Solution

The fourth proportional to 391,729.64, 540,387.90 and 255,843.18 is: 352,933.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,729.64 : 540,387.90 = 255,843.18 : x
  2. Step 2: Convert to fraction form
    391,729.64/540,387.90 = 255,843.18/x
  3. Step 3: Cross multiply
    391,729.64x = 540,387.90 × 255,843.18
  4. Step 4: Simplify right side
    391,729.64x = 138,254,558,769.52
  5. Step 5: Solve for x
    x = 138,254,558,769.52/391,729.64
  6. Step 6: Final answer
    x = 352,933.62

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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.