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Finding the Fourth Proportional to 746.80, 1,120.47 and 361.78

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Solution

The fourth proportional to 746.80, 1,120.47 and 361.78 is: 542.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    746.80 : 1,120.47 = 361.78 : x
  2. Step 2: Convert to fraction form
    746.80/1,120.47 = 361.78/x
  3. Step 3: Cross multiply
    746.80x = 1,120.47 × 361.78
  4. Step 4: Simplify right side
    746.80x = 405,363.64
  5. Step 5: Solve for x
    x = 405,363.64/746.80
  6. Step 6: Final answer
    x = 542.80

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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.