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Finding the Fourth Proportional to 290.34, 435.17 and 221.63

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Solution

The fourth proportional to 290.34, 435.17 and 221.63 is: 332.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.34 : 435.17 = 221.63 : x
  2. Step 2: Convert to fraction form
    290.34/435.17 = 221.63/x
  3. Step 3: Cross multiply
    290.34x = 435.17 × 221.63
  4. Step 4: Simplify right side
    290.34x = 96,445.11
  5. Step 5: Solve for x
    x = 96,445.11/290.34
  6. Step 6: Final answer
    x = 332.18

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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.