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Finding the Fourth Proportional to 1,912.50, 2,870.10 and 1,091.43

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Solution

The fourth proportional to 1,912.50, 2,870.10 and 1,091.43 is: 1,637.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.50 : 2,870.10 = 1,091.43 : x
  2. Step 2: Convert to fraction form
    1,912.50/2,870.10 = 1,091.43/x
  3. Step 3: Cross multiply
    1,912.50x = 2,870.10 × 1,091.43
  4. Step 4: Simplify right side
    1,912.50x = 3,132,513.24
  5. Step 5: Solve for x
    x = 3,132,513.24/1,912.50
  6. Step 6: Final answer
    x = 1,637.92

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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.