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Finding the Fourth Proportional to 669, 1,002.87 and 504.21

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Solution

The fourth proportional to 669, 1,002.87 and 504.21 is: 755.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    669 : 1,002.87 = 504.21 : x
  2. Step 2: Convert to fraction form
    669/1,002.87 = 504.21/x
  3. Step 3: Cross multiply
    669x = 1,002.87 × 504.21
  4. Step 4: Simplify right side
    669x = 505,657.08
  5. Step 5: Solve for x
    x = 505,657.08/669
  6. Step 6: Final answer
    x = 755.84

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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.