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Finding the Fourth Proportional to 421.33, 581.46 and 290.11

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Solution

The fourth proportional to 421.33, 581.46 and 290.11 is: 400.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.33 : 581.46 = 290.11 : x
  2. Step 2: Convert to fraction form
    421.33/581.46 = 290.11/x
  3. Step 3: Cross multiply
    421.33x = 581.46 × 290.11
  4. Step 4: Simplify right side
    421.33x = 168,687.54
  5. Step 5: Solve for x
    x = 168,687.54/421.33
  6. Step 6: Final answer
    x = 400.37

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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.