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Finding the Fourth Proportional to 958.81, 1,438.45 and 309.55

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Solution

The fourth proportional to 958.81, 1,438.45 and 309.55 is: 464.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.81 : 1,438.45 = 309.55 : x
  2. Step 2: Convert to fraction form
    958.81/1,438.45 = 309.55/x
  3. Step 3: Cross multiply
    958.81x = 1,438.45 × 309.55
  4. Step 4: Simplify right side
    958.81x = 445,272.20
  5. Step 5: Solve for x
    x = 445,272.20/958.81
  6. Step 6: Final answer
    x = 464.40

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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.