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Finding the Fourth Proportional to 291.11, 435.81 and 255.11

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Solution

The fourth proportional to 291.11, 435.81 and 255.11 is: 381.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.11 : 435.81 = 255.11 : x
  2. Step 2: Convert to fraction form
    291.11/435.81 = 255.11/x
  3. Step 3: Cross multiply
    291.11x = 435.81 × 255.11
  4. Step 4: Simplify right side
    291.11x = 111,179.49
  5. Step 5: Solve for x
    x = 111,179.49/291.11
  6. Step 6: Final answer
    x = 381.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.