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Finding the Fourth Proportional to 980.08, 1,351.44 and 630.64

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Solution

The fourth proportional to 980.08, 1,351.44 and 630.64 is: 869.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.08 : 1,351.44 = 630.64 : x
  2. Step 2: Convert to fraction form
    980.08/1,351.44 = 630.64/x
  3. Step 3: Cross multiply
    980.08x = 1,351.44 × 630.64
  4. Step 4: Simplify right side
    980.08x = 852,272.12
  5. Step 5: Solve for x
    x = 852,272.12/980.08
  6. Step 6: Final answer
    x = 869.59

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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.