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Finding the Fourth Proportional to 289.38, 433.76 and 135.21

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Solution

The fourth proportional to 289.38, 433.76 and 135.21 is: 202.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.38 : 433.76 = 135.21 : x
  2. Step 2: Convert to fraction form
    289.38/433.76 = 135.21/x
  3. Step 3: Cross multiply
    289.38x = 433.76 × 135.21
  4. Step 4: Simplify right side
    289.38x = 58,648.01
  5. Step 5: Solve for x
    x = 58,648.01/289.38
  6. Step 6: Final answer
    x = 202.67

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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.