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Finding the Fourth Proportional to 290.33, 434.59 and 216.78

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Solution

The fourth proportional to 290.33, 434.59 and 216.78 is: 324.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.33 : 434.59 = 216.78 : x
  2. Step 2: Convert to fraction form
    290.33/434.59 = 216.78/x
  3. Step 3: Cross multiply
    290.33x = 434.59 × 216.78
  4. Step 4: Simplify right side
    290.33x = 94,210.42
  5. Step 5: Solve for x
    x = 94,210.42/290.33
  6. Step 6: Final answer
    x = 324.49

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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.