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Finding the Fourth Proportional to 669.26, 1,004.28 and 486.98

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Solution

The fourth proportional to 669.26, 1,004.28 and 486.98 is: 730.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.26 : 1,004.28 = 486.98 : x
  2. Step 2: Convert to fraction form
    669.26/1,004.28 = 486.98/x
  3. Step 3: Cross multiply
    669.26x = 1,004.28 × 486.98
  4. Step 4: Simplify right side
    669.26x = 489,064.27
  5. Step 5: Solve for x
    x = 489,064.27/669.26
  6. Step 6: Final answer
    x = 730.75

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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.