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Finding the Fourth Proportional to 289.76, 434.39 and 167.87

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Solution

The fourth proportional to 289.76, 434.39 and 167.87 is: 251.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.76 : 434.39 = 167.87 : x
  2. Step 2: Convert to fraction form
    289.76/434.39 = 167.87/x
  3. Step 3: Cross multiply
    289.76x = 434.39 × 167.87
  4. Step 4: Simplify right side
    289.76x = 72,921.30
  5. Step 5: Solve for x
    x = 72,921.30/289.76
  6. Step 6: Final answer
    x = 251.67

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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.