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Finding the Fourth Proportional to 980.28, 1,353.72 and 839.58

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Solution

The fourth proportional to 980.28, 1,353.72 and 839.58 is: 1,159.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.28 : 1,353.72 = 839.58 : x
  2. Step 2: Convert to fraction form
    980.28/1,353.72 = 839.58/x
  3. Step 3: Cross multiply
    980.28x = 1,353.72 × 839.58
  4. Step 4: Simplify right side
    980.28x = 1,136,556.24
  5. Step 5: Solve for x
    x = 1,136,556.24/980.28
  6. Step 6: Final answer
    x = 1,159.42

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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.