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Finding the Fourth Proportional to 746.63, 1,120.06 and 381.22

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Solution

The fourth proportional to 746.63, 1,120.06 and 381.22 is: 571.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    746.63 : 1,120.06 = 381.22 : x
  2. Step 2: Convert to fraction form
    746.63/1,120.06 = 381.22/x
  3. Step 3: Cross multiply
    746.63x = 1,120.06 × 381.22
  4. Step 4: Simplify right side
    746.63x = 426,989.27
  5. Step 5: Solve for x
    x = 426,989.27/746.63
  6. Step 6: Final answer
    x = 571.89

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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.