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Finding the Fourth Proportional to 980.68, 1,478.31 and 844.84

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Solution

The fourth proportional to 980.68, 1,478.31 and 844.84 is: 1,273.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.68 : 1,478.31 = 844.84 : x
  2. Step 2: Convert to fraction form
    980.68/1,478.31 = 844.84/x
  3. Step 3: Cross multiply
    980.68x = 1,478.31 × 844.84
  4. Step 4: Simplify right side
    980.68x = 1,248,935.42
  5. Step 5: Solve for x
    x = 1,248,935.42/980.68
  6. Step 6: Final answer
    x = 1,273.54

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.