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Finding the Fourth Proportional to 818.83, 1,128.79 and 622.00

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Solution

The fourth proportional to 818.83, 1,128.79 and 622.00 is: 857.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.83 : 1,128.79 = 622.00 : x
  2. Step 2: Convert to fraction form
    818.83/1,128.79 = 622.00/x
  3. Step 3: Cross multiply
    818.83x = 1,128.79 × 622.00
  4. Step 4: Simplify right side
    818.83x = 702,103.00
  5. Step 5: Solve for x
    x = 702,103.00/818.83
  6. Step 6: Final answer
    x = 857.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.