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Finding the Fourth Proportional to 669.79, 1,003.87 and 361.45

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Solution

The fourth proportional to 669.79, 1,003.87 and 361.45 is: 541.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.79 : 1,003.87 = 361.45 : x
  2. Step 2: Convert to fraction form
    669.79/1,003.87 = 361.45/x
  3. Step 3: Cross multiply
    669.79x = 1,003.87 × 361.45
  4. Step 4: Simplify right side
    669.79x = 362,848.81
  5. Step 5: Solve for x
    x = 362,848.81/669.79
  6. Step 6: Final answer
    x = 541.74

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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.