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Finding the Fourth Proportional to 326,811.70, 490,391.70 and 127,138.60

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Solution

The fourth proportional to 326,811.70, 490,391.70 and 127,138.60 is: 190,775.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,811.70 : 490,391.70 = 127,138.60 : x
  2. Step 2: Convert to fraction form
    326,811.70/490,391.70 = 127,138.60/x
  3. Step 3: Cross multiply
    326,811.70x = 490,391.70 × 127,138.60
  4. Step 4: Simplify right side
    326,811.70x = 62,347,714,189.62
  5. Step 5: Solve for x
    x = 62,347,714,189.62/326,811.70
  6. Step 6: Final answer
    x = 190,775.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.