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Finding the Fourth Proportional to 386.88, 580.32 and 191.84

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Solution

The fourth proportional to 386.88, 580.32 and 191.84 is: 287.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.88 : 580.32 = 191.84 : x
  2. Step 2: Convert to fraction form
    386.88/580.32 = 191.84/x
  3. Step 3: Cross multiply
    386.88x = 580.32 × 191.84
  4. Step 4: Simplify right side
    386.88x = 111,328.59
  5. Step 5: Solve for x
    x = 111,328.59/386.88
  6. Step 6: Final answer
    x = 287.76

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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.