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Finding the Fourth Proportional to 387.11, 580.72 and 127.03

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Solution

The fourth proportional to 387.11, 580.72 and 127.03 is: 190.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.11 : 580.72 = 127.03 : x
  2. Step 2: Convert to fraction form
    387.11/580.72 = 127.03/x
  3. Step 3: Cross multiply
    387.11x = 580.72 × 127.03
  4. Step 4: Simplify right side
    387.11x = 73,768.86
  5. Step 5: Solve for x
    x = 73,768.86/387.11
  6. Step 6: Final answer
    x = 190.56

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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.