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Finding the Fourth Proportional to 393,661.28, 590,585.63 and 127,421.78

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Solution

The fourth proportional to 393,661.28, 590,585.63 and 127,421.78 is: 191,162.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,661.28 : 590,585.63 = 127,421.78 : x
  2. Step 2: Convert to fraction form
    393,661.28/590,585.63 = 127,421.78/x
  3. Step 3: Cross multiply
    393,661.28x = 590,585.63 × 127,421.78
  4. Step 4: Simplify right side
    393,661.28x = 75,253,469,264.09
  5. Step 5: Solve for x
    x = 75,253,469,264.09/393,661.28
  6. Step 6: Final answer
    x = 191,162.99

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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.