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Finding the Fourth Proportional to 1,861.32, 2,790.22 and 983.64

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Solution

The fourth proportional to 1,861.32, 2,790.22 and 983.64 is: 1,474.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,861.32 : 2,790.22 = 983.64 : x
  2. Step 2: Convert to fraction form
    1,861.32/2,790.22 = 983.64/x
  3. Step 3: Cross multiply
    1,861.32x = 2,790.22 × 983.64
  4. Step 4: Simplify right side
    1,861.32x = 2,744,572.00
  5. Step 5: Solve for x
    x = 2,744,572.00/1,861.32
  6. Step 6: Final answer
    x = 1,474.53

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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.