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Finding the Fourth Proportional to 980.15, 1,349.19 and 855.59

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Solution

The fourth proportional to 980.15, 1,349.19 and 855.59 is: 1,177.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.15 : 1,349.19 = 855.59 : x
  2. Step 2: Convert to fraction form
    980.15/1,349.19 = 855.59/x
  3. Step 3: Cross multiply
    980.15x = 1,349.19 × 855.59
  4. Step 4: Simplify right side
    980.15x = 1,154,346.73
  5. Step 5: Solve for x
    x = 1,154,346.73/980.15
  6. Step 6: Final answer
    x = 1,177.73

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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.