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Finding the Fourth Proportional to 1,083.36, 1,618.44 and 891.12

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Solution

The fourth proportional to 1,083.36, 1,618.44 and 891.12 is: 1,331.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,083.36 : 1,618.44 = 891.12 : x
  2. Step 2: Convert to fraction form
    1,083.36/1,618.44 = 891.12/x
  3. Step 3: Cross multiply
    1,083.36x = 1,618.44 × 891.12
  4. Step 4: Simplify right side
    1,083.36x = 1,442,224.25
  5. Step 5: Solve for x
    x = 1,442,224.25/1,083.36
  6. Step 6: Final answer
    x = 1,331.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.