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Finding the Fourth Proportional to 290.57, 436.04 and 218.61

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Solution

The fourth proportional to 290.57, 436.04 and 218.61 is: 328.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.57 : 436.04 = 218.61 : x
  2. Step 2: Convert to fraction form
    290.57/436.04 = 218.61/x
  3. Step 3: Cross multiply
    290.57x = 436.04 × 218.61
  4. Step 4: Simplify right side
    290.57x = 95,321.61
  5. Step 5: Solve for x
    x = 95,321.61/290.57
  6. Step 6: Final answer
    x = 328.05

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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.