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Finding the Fourth Proportional to 289.61, 434.39 and 167.79

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Solution

The fourth proportional to 289.61, 434.39 and 167.79 is: 251.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.61 : 434.39 = 167.79 : x
  2. Step 2: Convert to fraction form
    289.61/434.39 = 167.79/x
  3. Step 3: Cross multiply
    289.61x = 434.39 × 167.79
  4. Step 4: Simplify right side
    289.61x = 72,885.46
  5. Step 5: Solve for x
    x = 72,885.46/289.61
  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.