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Finding the Fourth Proportional to 386.92, 580.45 and 191.93

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Solution

The fourth proportional to 386.92, 580.45 and 191.93 is: 287.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.92 : 580.45 = 191.93 : x
  2. Step 2: Convert to fraction form
    386.92/580.45 = 191.93/x
  3. Step 3: Cross multiply
    386.92x = 580.45 × 191.93
  4. Step 4: Simplify right side
    386.92x = 111,406.42
  5. Step 5: Solve for x
    x = 111,406.42/386.92
  6. Step 6: Final answer
    x = 287.93

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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.