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Finding the Fourth Proportional to 1,186.09, 1,636.86 and 662.14

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Solution

The fourth proportional to 1,186.09, 1,636.86 and 662.14 is: 913.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.09 : 1,636.86 = 662.14 : x
  2. Step 2: Convert to fraction form
    1,186.09/1,636.86 = 662.14/x
  3. Step 3: Cross multiply
    1,186.09x = 1,636.86 × 662.14
  4. Step 4: Simplify right side
    1,186.09x = 1,083,830.48
  5. Step 5: Solve for x
    x = 1,083,830.48/1,186.09
  6. Step 6: Final answer
    x = 913.78

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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.