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Finding the Fourth Proportional to 980.55, 1,353.74 and 649.26

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Solution

The fourth proportional to 980.55, 1,353.74 and 649.26 is: 896.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.55 : 1,353.74 = 649.26 : x
  2. Step 2: Convert to fraction form
    980.55/1,353.74 = 649.26/x
  3. Step 3: Cross multiply
    980.55x = 1,353.74 × 649.26
  4. Step 4: Simplify right side
    980.55x = 878,929.23
  5. Step 5: Solve for x
    x = 878,929.23/980.55
  6. Step 6: Final answer
    x = 896.36

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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.