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Finding the Fourth Proportional to 1,231, 1,698.80 and 679

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Solution

The fourth proportional to 1,231, 1,698.80 and 679 is: 937.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231 : 1,698.80 = 679 : x
  2. Step 2: Convert to fraction form
    1,231/1,698.80 = 679/x
  3. Step 3: Cross multiply
    1,231x = 1,698.80 × 679
  4. Step 4: Simplify right side
    1,231x = 1,153,485.20
  5. Step 5: Solve for x
    x = 1,153,485.20/1,231
  6. Step 6: Final answer
    x = 937.03

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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.