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Finding the Fourth Proportional to 669.09, 1,002.36 and 339.63

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Solution

The fourth proportional to 669.09, 1,002.36 and 339.63 is: 508.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.09 : 1,002.36 = 339.63 : x
  2. Step 2: Convert to fraction form
    669.09/1,002.36 = 339.63/x
  3. Step 3: Cross multiply
    669.09x = 1,002.36 × 339.63
  4. Step 4: Simplify right side
    669.09x = 340,431.53
  5. Step 5: Solve for x
    x = 340,431.53/669.09
  6. Step 6: Final answer
    x = 508.80

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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.