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Finding the Fourth Proportional to 855.40, 1,283.10 and 754.60

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Solution

The fourth proportional to 855.40, 1,283.10 and 754.60 is: 1,131.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.40 : 1,283.10 = 754.60 : x
  2. Step 2: Convert to fraction form
    855.40/1,283.10 = 754.60/x
  3. Step 3: Cross multiply
    855.40x = 1,283.10 × 754.60
  4. Step 4: Simplify right side
    855.40x = 968,227.26
  5. Step 5: Solve for x
    x = 968,227.26/855.40
  6. Step 6: Final answer
    x = 1,131.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.