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Finding the Fourth Proportional to 980.90, 1,478.40 and 845.58

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Solution

The fourth proportional to 980.90, 1,478.40 and 845.58 is: 1,274.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.90 : 1,478.40 = 845.58 : x
  2. Step 2: Convert to fraction form
    980.90/1,478.40 = 845.58/x
  3. Step 3: Cross multiply
    980.90x = 1,478.40 × 845.58
  4. Step 4: Simplify right side
    980.90x = 1,250,105.47
  5. Step 5: Solve for x
    x = 1,250,105.47/980.90
  6. Step 6: Final answer
    x = 1,274.44

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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.