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Finding the Fourth Proportional to 669.98, 1,002.81 and 395.39

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Solution

The fourth proportional to 669.98, 1,002.81 and 395.39 is: 591.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.98 : 1,002.81 = 395.39 : x
  2. Step 2: Convert to fraction form
    669.98/1,002.81 = 395.39/x
  3. Step 3: Cross multiply
    669.98x = 1,002.81 × 395.39
  4. Step 4: Simplify right side
    669.98x = 396,501.05
  5. Step 5: Solve for x
    x = 396,501.05/669.98
  6. Step 6: Final answer
    x = 591.81

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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.