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Finding the Fourth Proportional to 1,186.30, 1,636.36 and 854.11

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Solution

The fourth proportional to 1,186.30, 1,636.36 and 854.11 is: 1,178.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.30 : 1,636.36 = 854.11 : x
  2. Step 2: Convert to fraction form
    1,186.30/1,636.36 = 854.11/x
  3. Step 3: Cross multiply
    1,186.30x = 1,636.36 × 854.11
  4. Step 4: Simplify right side
    1,186.30x = 1,397,631.44
  5. Step 5: Solve for x
    x = 1,397,631.44/1,186.30
  6. Step 6: Final answer
    x = 1,178.14

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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.