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Finding the Fourth Proportional to 217.79, 300.69 and 151.47

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Solution

The fourth proportional to 217.79, 300.69 and 151.47 is: 209.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.79 : 300.69 = 151.47 : x
  2. Step 2: Convert to fraction form
    217.79/300.69 = 151.47/x
  3. Step 3: Cross multiply
    217.79x = 300.69 × 151.47
  4. Step 4: Simplify right side
    217.79x = 45,546.64
  5. Step 5: Solve for x
    x = 45,546.64/217.79
  6. Step 6: Final answer
    x = 209.13

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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.