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Finding the Fourth Proportional to 670.44, 1,004.70 and 381.28

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Solution

The fourth proportional to 670.44, 1,004.70 and 381.28 is: 571.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.44 : 1,004.70 = 381.28 : x
  2. Step 2: Convert to fraction form
    670.44/1,004.70 = 381.28/x
  3. Step 3: Cross multiply
    670.44x = 1,004.70 × 381.28
  4. Step 4: Simplify right side
    670.44x = 383,072.02
  5. Step 5: Solve for x
    x = 383,072.02/670.44
  6. Step 6: Final answer
    x = 571.37

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.