Home / 1,938.62-2,912.40-1,118.90

Finding the Fourth Proportional to 1,938.62, 2,912.40 and 1,118.90

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Solution

The fourth proportional to 1,938.62, 2,912.40 and 1,118.90 is: 1,680.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,938.62 : 2,912.40 = 1,118.90 : x
  2. Step 2: Convert to fraction form
    1,938.62/2,912.40 = 1,118.90/x
  3. Step 3: Cross multiply
    1,938.62x = 2,912.40 × 1,118.90
  4. Step 4: Simplify right side
    1,938.62x = 3,258,684.36
  5. Step 5: Solve for x
    x = 3,258,684.36/1,938.62
  6. Step 6: Final answer
    x = 1,680.93

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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.