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Finding the Fourth Proportional to 1,991.98, 2,988 and 693.49

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Solution

The fourth proportional to 1,991.98, 2,988 and 693.49 is: 1,040.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.98 : 2,988 = 693.49 : x
  2. Step 2: Convert to fraction form
    1,991.98/2,988 = 693.49/x
  3. Step 3: Cross multiply
    1,991.98x = 2,988 × 693.49
  4. Step 4: Simplify right side
    1,991.98x = 2,072,148.12
  5. Step 5: Solve for x
    x = 2,072,148.12/1,991.98
  6. Step 6: Final answer
    x = 1,040.25

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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.