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Finding the Fourth Proportional to 289.91, 434.26 and 186.67

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Solution

The fourth proportional to 289.91, 434.26 and 186.67 is: 279.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.91 : 434.26 = 186.67 : x
  2. Step 2: Convert to fraction form
    289.91/434.26 = 186.67/x
  3. Step 3: Cross multiply
    289.91x = 434.26 × 186.67
  4. Step 4: Simplify right side
    289.91x = 81,063.31
  5. Step 5: Solve for x
    x = 81,063.31/289.91
  6. Step 6: Final answer
    x = 279.62

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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.