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Finding the Fourth Proportional to 669.78, 1,003.86 and 361.44

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Solution

The fourth proportional to 669.78, 1,003.86 and 361.44 is: 541.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.78 : 1,003.86 = 361.44 : x
  2. Step 2: Convert to fraction form
    669.78/1,003.86 = 361.44/x
  3. Step 3: Cross multiply
    669.78x = 1,003.86 × 361.44
  4. Step 4: Simplify right side
    669.78x = 362,835.16
  5. Step 5: Solve for x
    x = 362,835.16/669.78
  6. Step 6: Final answer
    x = 541.72

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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.