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Finding the Fourth Proportional to 1,379.25, 1,903.50 and 855.45

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Solution

The fourth proportional to 1,379.25, 1,903.50 and 855.45 is: 1,180.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.25 : 1,903.50 = 855.45 : x
  2. Step 2: Convert to fraction form
    1,379.25/1,903.50 = 855.45/x
  3. Step 3: Cross multiply
    1,379.25x = 1,903.50 × 855.45
  4. Step 4: Simplify right side
    1,379.25x = 1,628,349.08
  5. Step 5: Solve for x
    x = 1,628,349.08/1,379.25
  6. Step 6: Final answer
    x = 1,180.60

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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.