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Finding the Fourth Proportional to 217.65, 299.91 and 155.37

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Solution

The fourth proportional to 217.65, 299.91 and 155.37 is: 214.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.65 : 299.91 = 155.37 : x
  2. Step 2: Convert to fraction form
    217.65/299.91 = 155.37/x
  3. Step 3: Cross multiply
    217.65x = 299.91 × 155.37
  4. Step 4: Simplify right side
    217.65x = 46,597.02
  5. Step 5: Solve for x
    x = 46,597.02/217.65
  6. Step 6: Final answer
    x = 214.09

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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.