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Finding the Fourth Proportional to 387.36, 580.31 and 192.13

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Solution

The fourth proportional to 387.36, 580.31 and 192.13 is: 287.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.36 : 580.31 = 192.13 : x
  2. Step 2: Convert to fraction form
    387.36/580.31 = 192.13/x
  3. Step 3: Cross multiply
    387.36x = 580.31 × 192.13
  4. Step 4: Simplify right side
    387.36x = 111,494.96
  5. Step 5: Solve for x
    x = 111,494.96/387.36
  6. Step 6: Final answer
    x = 287.83

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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.