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Finding the Fourth Proportional to 326,812.70, 490,393.20 and 127,139.60

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Solution

The fourth proportional to 326,812.70, 490,393.20 and 127,139.60 is: 190,777.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,812.70 : 490,393.20 = 127,139.60 : x
  2. Step 2: Convert to fraction form
    326,812.70/490,393.20 = 127,139.60/x
  3. Step 3: Cross multiply
    326,812.70x = 490,393.20 × 127,139.60
  4. Step 4: Simplify right side
    326,812.70x = 62,348,395,290.72
  5. Step 5: Solve for x
    x = 62,348,395,290.72/326,812.70
  6. Step 6: Final answer
    x = 190,777.15

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1.5x scale

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.