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Finding the Fourth Proportional to 217.99, 300.79 and 130.64

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Solution

The fourth proportional to 217.99, 300.79 and 130.64 is: 180.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.99 : 300.79 = 130.64 : x
  2. Step 2: Convert to fraction form
    217.99/300.79 = 130.64/x
  3. Step 3: Cross multiply
    217.99x = 300.79 × 130.64
  4. Step 4: Simplify right side
    217.99x = 39,295.21
  5. Step 5: Solve for x
    x = 39,295.21/217.99
  6. Step 6: Final answer
    x = 180.26

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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.