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Finding the Fourth Proportional to 290.67, 400.91 and 180.10

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Solution

The fourth proportional to 290.67, 400.91 and 180.10 is: 248.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.67 : 400.91 = 180.10 : x
  2. Step 2: Convert to fraction form
    290.67/400.91 = 180.10/x
  3. Step 3: Cross multiply
    290.67x = 400.91 × 180.10
  4. Step 4: Simplify right side
    290.67x = 72,202.99
  5. Step 5: Solve for x
    x = 72,202.99/290.67
  6. Step 6: Final answer
    x = 248.41

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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.