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Finding the Fourth Proportional to 818.43, 1,222.43 and 703.21

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Solution

The fourth proportional to 818.43, 1,222.43 and 703.21 is: 1,050.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.43 : 1,222.43 = 703.21 : x
  2. Step 2: Convert to fraction form
    818.43/1,222.43 = 703.21/x
  3. Step 3: Cross multiply
    818.43x = 1,222.43 × 703.21
  4. Step 4: Simplify right side
    818.43x = 859,618.89
  5. Step 5: Solve for x
    x = 859,618.89/818.43
  6. Step 6: Final answer
    x = 1,050.33

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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.