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Finding the Fourth Proportional to 217.80, 300.69 and 155.79

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Solution

The fourth proportional to 217.80, 300.69 and 155.79 is: 215.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.80 : 300.69 = 155.79 : x
  2. Step 2: Convert to fraction form
    217.80/300.69 = 155.79/x
  3. Step 3: Cross multiply
    217.80x = 300.69 × 155.79
  4. Step 4: Simplify right side
    217.80x = 46,844.50
  5. Step 5: Solve for x
    x = 46,844.50/217.80
  6. Step 6: Final answer
    x = 215.08

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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.