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Finding the Fourth Proportional to 1,035.64, 1,427 and 980.44

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Solution

The fourth proportional to 1,035.64, 1,427 and 980.44 is: 1,350.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,035.64 : 1,427 = 980.44 : x
  2. Step 2: Convert to fraction form
    1,035.64/1,427 = 980.44/x
  3. Step 3: Cross multiply
    1,035.64x = 1,427 × 980.44
  4. Step 4: Simplify right side
    1,035.64x = 1,399,087.88
  5. Step 5: Solve for x
    x = 1,399,087.88/1,035.64
  6. Step 6: Final answer
    x = 1,350.94

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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.