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Finding the Fourth Proportional to 290.69, 436.34 and 126.23

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Solution

The fourth proportional to 290.69, 436.34 and 126.23 is: 189.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.69 : 436.34 = 126.23 : x
  2. Step 2: Convert to fraction form
    290.69/436.34 = 126.23/x
  3. Step 3: Cross multiply
    290.69x = 436.34 × 126.23
  4. Step 4: Simplify right side
    290.69x = 55,079.66
  5. Step 5: Solve for x
    x = 55,079.66/290.69
  6. Step 6: Final answer
    x = 189.48

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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.