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Finding the Fourth Proportional to 290.81, 436.63 and 255.17

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Solution

The fourth proportional to 290.81, 436.63 and 255.17 is: 383.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.81 : 436.63 = 255.17 : x
  2. Step 2: Convert to fraction form
    290.81/436.63 = 255.17/x
  3. Step 3: Cross multiply
    290.81x = 436.63 × 255.17
  4. Step 4: Simplify right side
    290.81x = 111,414.88
  5. Step 5: Solve for x
    x = 111,414.88/290.81
  6. Step 6: Final answer
    x = 383.12

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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.