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Finding the Fourth Proportional to 391,704.87, 540,353.76 and 255,818.36

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Solution

The fourth proportional to 391,704.87, 540,353.76 and 255,818.36 is: 352,899.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,704.87 : 540,353.76 = 255,818.36 : x
  2. Step 2: Convert to fraction form
    391,704.87/540,353.76 = 255,818.36/x
  3. Step 3: Cross multiply
    391,704.87x = 540,353.76 × 255,818.36
  4. Step 4: Simplify right side
    391,704.87x = 138,232,410,001.27
  5. Step 5: Solve for x
    x = 138,232,410,001.27/391,704.87
  6. Step 6: Final answer
    x = 352,899.39

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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.