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Finding the Fourth Proportional to 290.45, 400.85 and 166.16

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Solution

The fourth proportional to 290.45, 400.85 and 166.16 is: 229.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.45 : 400.85 = 166.16 : x
  2. Step 2: Convert to fraction form
    290.45/400.85 = 166.16/x
  3. Step 3: Cross multiply
    290.45x = 400.85 × 166.16
  4. Step 4: Simplify right side
    290.45x = 66,602.40
  5. Step 5: Solve for x
    x = 66,602.40/290.45
  6. Step 6: Final answer
    x = 229.31

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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.