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Finding the Fourth Proportional to 290.78, 435.86 and 136.47

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Solution

The fourth proportional to 290.78, 435.86 and 136.47 is: 204.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.78 : 435.86 = 136.47 : x
  2. Step 2: Convert to fraction form
    290.78/435.86 = 136.47/x
  3. Step 3: Cross multiply
    290.78x = 435.86 × 136.47
  4. Step 4: Simplify right side
    290.78x = 59,481.13
  5. Step 5: Solve for x
    x = 59,481.13/290.78
  6. Step 6: Final answer
    x = 204.56

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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.