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Finding the Fourth Proportional to 958.64, 1,438.64 and 411.21

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Solution

The fourth proportional to 958.64, 1,438.64 and 411.21 is: 617.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.64 : 1,438.64 = 411.21 : x
  2. Step 2: Convert to fraction form
    958.64/1,438.64 = 411.21/x
  3. Step 3: Cross multiply
    958.64x = 1,438.64 × 411.21
  4. Step 4: Simplify right side
    958.64x = 591,583.15
  5. Step 5: Solve for x
    x = 591,583.15/958.64
  6. Step 6: Final answer
    x = 617.11

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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.