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Finding the Fourth Proportional to 393,638.88, 590,552.03 and 127,399.40

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Solution

The fourth proportional to 393,638.88, 590,552.03 and 127,399.40 is: 191,129.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,638.88 : 590,552.03 = 127,399.40 : x
  2. Step 2: Convert to fraction form
    393,638.88/590,552.03 = 127,399.40/x
  3. Step 3: Cross multiply
    393,638.88x = 590,552.03 × 127,399.40
  4. Step 4: Simplify right side
    393,638.88x = 75,235,975,607.91
  5. Step 5: Solve for x
    x = 75,235,975,607.91/393,638.88
  6. Step 6: Final answer
    x = 191,129.43

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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.