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Finding the Fourth Proportional to 958.32, 1,437.78 and 381.20

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Solution

The fourth proportional to 958.32, 1,437.78 and 381.20 is: 571.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.32 : 1,437.78 = 381.20 : x
  2. Step 2: Convert to fraction form
    958.32/1,437.78 = 381.20/x
  3. Step 3: Cross multiply
    958.32x = 1,437.78 × 381.20
  4. Step 4: Simplify right side
    958.32x = 548,074.55
  5. Step 5: Solve for x
    x = 548,074.55/958.32
  6. Step 6: Final answer
    x = 571.91

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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.