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Finding the Fourth Proportional to 818.90, 1,129.29 and 622.07

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Solution

The fourth proportional to 818.90, 1,129.29 and 622.07 is: 857.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.90 : 1,129.29 = 622.07 : x
  2. Step 2: Convert to fraction form
    818.90/1,129.29 = 622.07/x
  3. Step 3: Cross multiply
    818.90x = 1,129.29 × 622.07
  4. Step 4: Simplify right side
    818.90x = 702,491.78
  5. Step 5: Solve for x
    x = 702,491.78/818.90
  6. Step 6: Final answer
    x = 857.85

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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.