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Finding the Fourth Proportional to 669.19, 1,004.08 and 395.81

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Solution

The fourth proportional to 669.19, 1,004.08 and 395.81 is: 593.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.19 : 1,004.08 = 395.81 : x
  2. Step 2: Convert to fraction form
    669.19/1,004.08 = 395.81/x
  3. Step 3: Cross multiply
    669.19x = 1,004.08 × 395.81
  4. Step 4: Simplify right side
    669.19x = 397,425.40
  5. Step 5: Solve for x
    x = 397,425.40/669.19
  6. Step 6: Final answer
    x = 593.89

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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.