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Finding the Fourth Proportional to 289.45, 399.43 and 158.46

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Solution

The fourth proportional to 289.45, 399.43 and 158.46 is: 218.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.45 : 399.43 = 158.46 : x
  2. Step 2: Convert to fraction form
    289.45/399.43 = 158.46/x
  3. Step 3: Cross multiply
    289.45x = 399.43 × 158.46
  4. Step 4: Simplify right side
    289.45x = 63,293.68
  5. Step 5: Solve for x
    x = 63,293.68/289.45
  6. Step 6: Final answer
    x = 218.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.