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Finding the Fourth Proportional to 902.90, 1,239.09 and 845.30

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Solution

The fourth proportional to 902.90, 1,239.09 and 845.30 is: 1,160.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.90 : 1,239.09 = 845.30 : x
  2. Step 2: Convert to fraction form
    902.90/1,239.09 = 845.30/x
  3. Step 3: Cross multiply
    902.90x = 1,239.09 × 845.30
  4. Step 4: Simplify right side
    902.90x = 1,047,398.55
  5. Step 5: Solve for x
    x = 1,047,398.55/902.90
  6. Step 6: Final answer
    x = 1,160.04

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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.