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Finding the Fourth Proportional to 355,583.70, 490,286.22 and 287,389.80

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Solution

The fourth proportional to 355,583.70, 490,286.22 and 287,389.80 is: 396,259.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    355,583.70 : 490,286.22 = 287,389.80 : x
  2. Step 2: Convert to fraction form
    355,583.70/490,286.22 = 287,389.80/x
  3. Step 3: Cross multiply
    355,583.70x = 490,286.22 × 287,389.80
  4. Step 4: Simplify right side
    355,583.70x = 140,903,258,708.56
  5. Step 5: Solve for x
    x = 140,903,258,708.56/355,583.70
  6. Step 6: Final answer
    x = 396,259.05

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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.