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Finding the Fourth Proportional to 669.45, 1,004.63 and 613.86

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Solution

The fourth proportional to 669.45, 1,004.63 and 613.86 is: 921.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.45 : 1,004.63 = 613.86 : x
  2. Step 2: Convert to fraction form
    669.45/1,004.63 = 613.86/x
  3. Step 3: Cross multiply
    669.45x = 1,004.63 × 613.86
  4. Step 4: Simplify right side
    669.45x = 616,699.10
  5. Step 5: Solve for x
    x = 616,699.10/669.45
  6. Step 6: Final answer
    x = 921.20

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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.