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Finding the Fourth Proportional to 290.78, 401.16 and 180.20

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Solution

The fourth proportional to 290.78, 401.16 and 180.20 is: 248.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.78 : 401.16 = 180.20 : x
  2. Step 2: Convert to fraction form
    290.78/401.16 = 180.20/x
  3. Step 3: Cross multiply
    290.78x = 401.16 × 180.20
  4. Step 4: Simplify right side
    290.78x = 72,289.03
  5. Step 5: Solve for x
    x = 72,289.03/290.78
  6. Step 6: Final answer
    x = 248.60

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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.