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Finding the Fourth Proportional to 980.44, 1,350.88 and 648.32

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Solution

The fourth proportional to 980.44, 1,350.88 and 648.32 is: 893.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.44 : 1,350.88 = 648.32 : x
  2. Step 2: Convert to fraction form
    980.44/1,350.88 = 648.32/x
  3. Step 3: Cross multiply
    980.44x = 1,350.88 × 648.32
  4. Step 4: Simplify right side
    980.44x = 875,802.52
  5. Step 5: Solve for x
    x = 875,802.52/980.44
  6. Step 6: Final answer
    x = 893.27

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1.5x scale

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.