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Finding the Fourth Proportional to 958.62, 1,438.02 and 309.54

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Solution

The fourth proportional to 958.62, 1,438.02 and 309.54 is: 464.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.62 : 1,438.02 = 309.54 : x
  2. Step 2: Convert to fraction form
    958.62/1,438.02 = 309.54/x
  3. Step 3: Cross multiply
    958.62x = 1,438.02 × 309.54
  4. Step 4: Simplify right side
    958.62x = 445,124.71
  5. Step 5: Solve for x
    x = 445,124.71/958.62
  6. Step 6: Final answer
    x = 464.34

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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.