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Finding the Fourth Proportional to 289.76, 434.33 and 208.55

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Solution

The fourth proportional to 289.76, 434.33 and 208.55 is: 312.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.76 : 434.33 = 208.55 : x
  2. Step 2: Convert to fraction form
    289.76/434.33 = 208.55/x
  3. Step 3: Cross multiply
    289.76x = 434.33 × 208.55
  4. Step 4: Simplify right side
    289.76x = 90,579.56
  5. Step 5: Solve for x
    x = 90,579.56/289.76
  6. Step 6: Final answer
    x = 312.61

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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.