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Finding the Fourth Proportional to 980.04, 1,352.16 and 648.12

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Solution

The fourth proportional to 980.04, 1,352.16 and 648.12 is: 894.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.04 : 1,352.16 = 648.12 : x
  2. Step 2: Convert to fraction form
    980.04/1,352.16 = 648.12/x
  3. Step 3: Cross multiply
    980.04x = 1,352.16 × 648.12
  4. Step 4: Simplify right side
    980.04x = 876,361.94
  5. Step 5: Solve for x
    x = 876,361.94/980.04
  6. Step 6: Final answer
    x = 894.21

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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.