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Finding the Fourth Proportional to 1,861.74, 2,792.90 and 765.81

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Solution

The fourth proportional to 1,861.74, 2,792.90 and 765.81 is: 1,148.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,861.74 : 2,792.90 = 765.81 : x
  2. Step 2: Convert to fraction form
    1,861.74/2,792.90 = 765.81/x
  3. Step 3: Cross multiply
    1,861.74x = 2,792.90 × 765.81
  4. Step 4: Simplify right side
    1,861.74x = 2,138,830.75
  5. Step 5: Solve for x
    x = 2,138,830.75/1,861.74
  6. Step 6: Final answer
    x = 1,148.83

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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.