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Finding the Fourth Proportional to 290.04, 434.95 and 84.54

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Solution

The fourth proportional to 290.04, 434.95 and 84.54 is: 126.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.04 : 434.95 = 84.54 : x
  2. Step 2: Convert to fraction form
    290.04/434.95 = 84.54/x
  3. Step 3: Cross multiply
    290.04x = 434.95 × 84.54
  4. Step 4: Simplify right side
    290.04x = 36,770.67
  5. Step 5: Solve for x
    x = 36,770.67/290.04
  6. Step 6: Final answer
    x = 126.78

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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.