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Finding the Fourth Proportional to 393,921.60, 590,955.30 and 127,690.80

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Solution

The fourth proportional to 393,921.60, 590,955.30 and 127,690.80 is: 191,559.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,921.60 : 590,955.30 = 127,690.80 : x
  2. Step 2: Convert to fraction form
    393,921.60/590,955.30 = 127,690.80/x
  3. Step 3: Cross multiply
    393,921.60x = 590,955.30 × 127,690.80
  4. Step 4: Simplify right side
    393,921.60x = 75,459,555,021.24
  5. Step 5: Solve for x
    x = 75,459,555,021.24/393,921.60
  6. Step 6: Final answer
    x = 191,559.83

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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.