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Finding the Fourth Proportional to 1,861.58, 2,792.92 and 766

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Solution

The fourth proportional to 1,861.58, 2,792.92 and 766 is: 1,149.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,861.58 : 2,792.92 = 766 : x
  2. Step 2: Convert to fraction form
    1,861.58/2,792.92 = 766/x
  3. Step 3: Cross multiply
    1,861.58x = 2,792.92 × 766
  4. Step 4: Simplify right side
    1,861.58x = 2,139,376.72
  5. Step 5: Solve for x
    x = 2,139,376.72/1,861.58
  6. Step 6: Final answer
    x = 1,149.23

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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.