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Finding the Fourth Proportional to 1,912.98, 2,867.79 and 988.07

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Solution

The fourth proportional to 1,912.98, 2,867.79 and 988.07 is: 1,481.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.98 : 2,867.79 = 988.07 : x
  2. Step 2: Convert to fraction form
    1,912.98/2,867.79 = 988.07/x
  3. Step 3: Cross multiply
    1,912.98x = 2,867.79 × 988.07
  4. Step 4: Simplify right side
    1,912.98x = 2,833,577.27
  5. Step 5: Solve for x
    x = 2,833,577.27/1,912.98
  6. Step 6: Final answer
    x = 1,481.24

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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.