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Finding the Fourth Proportional to 958.91, 1,438.37 and 309.70

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Solution

The fourth proportional to 958.91, 1,438.37 and 309.70 is: 464.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.91 : 1,438.37 = 309.70 : x
  2. Step 2: Convert to fraction form
    958.91/1,438.37 = 309.70/x
  3. Step 3: Cross multiply
    958.91x = 1,438.37 × 309.70
  4. Step 4: Simplify right side
    958.91x = 445,463.19
  5. Step 5: Solve for x
    x = 445,463.19/958.91
  6. Step 6: Final answer
    x = 464.55

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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.