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Finding the Fourth Proportional to 1,383.83, 2,076.12 and 689.66

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Solution

The fourth proportional to 1,383.83, 2,076.12 and 689.66 is: 1,034.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.83 : 2,076.12 = 689.66 : x
  2. Step 2: Convert to fraction form
    1,383.83/2,076.12 = 689.66/x
  3. Step 3: Cross multiply
    1,383.83x = 2,076.12 × 689.66
  4. Step 4: Simplify right side
    1,383.83x = 1,431,816.26
  5. Step 5: Solve for x
    x = 1,431,816.26/1,383.83
  6. Step 6: Final answer
    x = 1,034.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.