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Finding the Fourth Proportional to 839.10, 1,255.70 and 664.22

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Solution

The fourth proportional to 839.10, 1,255.70 and 664.22 is: 993.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.10 : 1,255.70 = 664.22 : x
  2. Step 2: Convert to fraction form
    839.10/1,255.70 = 664.22/x
  3. Step 3: Cross multiply
    839.10x = 1,255.70 × 664.22
  4. Step 4: Simplify right side
    839.10x = 834,061.05
  5. Step 5: Solve for x
    x = 834,061.05/839.10
  6. Step 6: Final answer
    x = 993.99

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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.