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Finding the Fourth Proportional to 1,861.56, 2,790.20 and 1,040.22

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Solution

The fourth proportional to 1,861.56, 2,790.20 and 1,040.22 is: 1,559.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,861.56 : 2,790.20 = 1,040.22 : x
  2. Step 2: Convert to fraction form
    1,861.56/2,790.20 = 1,040.22/x
  3. Step 3: Cross multiply
    1,861.56x = 2,790.20 × 1,040.22
  4. Step 4: Simplify right side
    1,861.56x = 2,902,421.84
  5. Step 5: Solve for x
    x = 2,902,421.84/1,861.56
  6. Step 6: Final answer
    x = 1,559.13

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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.