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Finding the Fourth Proportional to 386.22, 577.57 and 288.79

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Solution

The fourth proportional to 386.22, 577.57 and 288.79 is: 431.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.22 : 577.57 = 288.79 : x
  2. Step 2: Convert to fraction form
    386.22/577.57 = 288.79/x
  3. Step 3: Cross multiply
    386.22x = 577.57 × 288.79
  4. Step 4: Simplify right side
    386.22x = 166,796.44
  5. Step 5: Solve for x
    x = 166,796.44/386.22
  6. Step 6: Final answer
    x = 431.87

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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.