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Finding the Fourth Proportional to 217.50, 299.88 and 143.65

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Solution

The fourth proportional to 217.50, 299.88 and 143.65 is: 198.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.50 : 299.88 = 143.65 : x
  2. Step 2: Convert to fraction form
    217.50/299.88 = 143.65/x
  3. Step 3: Cross multiply
    217.50x = 299.88 × 143.65
  4. Step 4: Simplify right side
    217.50x = 43,077.76
  5. Step 5: Solve for x
    x = 43,077.76/217.50
  6. Step 6: Final answer
    x = 198.06

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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.