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Finding the Fourth Proportional to 671.39, 999.69 and 664.04

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Solution

The fourth proportional to 671.39, 999.69 and 664.04 is: 988.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.39 : 999.69 = 664.04 : x
  2. Step 2: Convert to fraction form
    671.39/999.69 = 664.04/x
  3. Step 3: Cross multiply
    671.39x = 999.69 × 664.04
  4. Step 4: Simplify right side
    671.39x = 663,829.15
  5. Step 5: Solve for x
    x = 663,829.15/671.39
  6. Step 6: Final answer
    x = 988.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.