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Finding the Fourth Proportional to 1,076.76, 1,485.90 and 611

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Solution

The fourth proportional to 1,076.76, 1,485.90 and 611 is: 843.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.76 : 1,485.90 = 611 : x
  2. Step 2: Convert to fraction form
    1,076.76/1,485.90 = 611/x
  3. Step 3: Cross multiply
    1,076.76x = 1,485.90 × 611
  4. Step 4: Simplify right side
    1,076.76x = 907,884.90
  5. Step 5: Solve for x
    x = 907,884.90/1,076.76
  6. Step 6: Final answer
    x = 843.16

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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.