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Finding the Fourth Proportional to 289.89, 434.84 and 193.77

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Solution

The fourth proportional to 289.89, 434.84 and 193.77 is: 290.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.89 : 434.84 = 193.77 : x
  2. Step 2: Convert to fraction form
    289.89/434.84 = 193.77/x
  3. Step 3: Cross multiply
    289.89x = 434.84 × 193.77
  4. Step 4: Simplify right side
    289.89x = 84,257.98
  5. Step 5: Solve for x
    x = 84,257.98/289.89
  6. Step 6: Final answer
    x = 290.66

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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.