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Finding the Fourth Proportional to 669.40, 1,005.92 and 361.48

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Solution

The fourth proportional to 669.40, 1,005.92 and 361.48 is: 543.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.40 : 1,005.92 = 361.48 : x
  2. Step 2: Convert to fraction form
    669.40/1,005.92 = 361.48/x
  3. Step 3: Cross multiply
    669.40x = 1,005.92 × 361.48
  4. Step 4: Simplify right side
    669.40x = 363,619.96
  5. Step 5: Solve for x
    x = 363,619.96/669.40
  6. Step 6: Final answer
    x = 543.20

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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.