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Finding the Fourth Proportional to 902.16, 1,245.96 and 622.80

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Solution

The fourth proportional to 902.16, 1,245.96 and 622.80 is: 860.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.16 : 1,245.96 = 622.80 : x
  2. Step 2: Convert to fraction form
    902.16/1,245.96 = 622.80/x
  3. Step 3: Cross multiply
    902.16x = 1,245.96 × 622.80
  4. Step 4: Simplify right side
    902.16x = 775,983.89
  5. Step 5: Solve for x
    x = 775,983.89/902.16
  6. Step 6: Final answer
    x = 860.14

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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.