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Finding the Fourth Proportional to 669.31, 1,002.60 and 394.57

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Solution

The fourth proportional to 669.31, 1,002.60 and 394.57 is: 591.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.31 : 1,002.60 = 394.57 : x
  2. Step 2: Convert to fraction form
    669.31/1,002.60 = 394.57/x
  3. Step 3: Cross multiply
    669.31x = 1,002.60 × 394.57
  4. Step 4: Simplify right side
    669.31x = 395,595.88
  5. Step 5: Solve for x
    x = 395,595.88/669.31
  6. Step 6: Final answer
    x = 591.05

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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.