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Finding the Fourth Proportional to 669.92, 1,004.72 and 636.98

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Solution

The fourth proportional to 669.92, 1,004.72 and 636.98 is: 955.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.92 : 1,004.72 = 636.98 : x
  2. Step 2: Convert to fraction form
    669.92/1,004.72 = 636.98/x
  3. Step 3: Cross multiply
    669.92x = 1,004.72 × 636.98
  4. Step 4: Simplify right side
    669.92x = 639,986.55
  5. Step 5: Solve for x
    x = 639,986.55/669.92
  6. Step 6: Final answer
    x = 955.32

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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.