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Finding the Fourth Proportional to 890.40, 1,223.21 and 798.33

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Solution

The fourth proportional to 890.40, 1,223.21 and 798.33 is: 1,096.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.40 : 1,223.21 = 798.33 : x
  2. Step 2: Convert to fraction form
    890.40/1,223.21 = 798.33/x
  3. Step 3: Cross multiply
    890.40x = 1,223.21 × 798.33
  4. Step 4: Simplify right side
    890.40x = 976,525.24
  5. Step 5: Solve for x
    x = 976,525.24/890.40
  6. Step 6: Final answer
    x = 1,096.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.