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Finding the Fourth Proportional to 217.91, 300.77 and 130.64

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Solution

The fourth proportional to 217.91, 300.77 and 130.64 is: 180.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.91 : 300.77 = 130.64 : x
  2. Step 2: Convert to fraction form
    217.91/300.77 = 130.64/x
  3. Step 3: Cross multiply
    217.91x = 300.77 × 130.64
  4. Step 4: Simplify right side
    217.91x = 39,290.44
  5. Step 5: Solve for x
    x = 39,290.44/217.91
  6. Step 6: Final answer
    x = 180.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.