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Finding the Fourth Proportional to 958.53, 1,438.10 and 309.31

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Solution

The fourth proportional to 958.53, 1,438.10 and 309.31 is: 464.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.53 : 1,438.10 = 309.31 : x
  2. Step 2: Convert to fraction form
    958.53/1,438.10 = 309.31/x
  3. Step 3: Cross multiply
    958.53x = 1,438.10 × 309.31
  4. Step 4: Simplify right side
    958.53x = 444,820.76
  5. Step 5: Solve for x
    x = 444,820.76/958.53
  6. Step 6: Final answer
    x = 464.07

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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.