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Finding the Fourth Proportional to 958.36, 1,437.08 and 438.21

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Solution

The fourth proportional to 958.36, 1,437.08 and 438.21 is: 657.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.36 : 1,437.08 = 438.21 : x
  2. Step 2: Convert to fraction form
    958.36/1,437.08 = 438.21/x
  3. Step 3: Cross multiply
    958.36x = 1,437.08 × 438.21
  4. Step 4: Simplify right side
    958.36x = 629,743.92
  5. Step 5: Solve for x
    x = 629,743.92/958.36
  6. Step 6: Final answer
    x = 657.11

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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.