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Finding the Fourth Proportional to 1,861.81, 2,792.75 and 765.93

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Solution

The fourth proportional to 1,861.81, 2,792.75 and 765.93 is: 1,148.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,861.81 : 2,792.75 = 765.93 : x
  2. Step 2: Convert to fraction form
    1,861.81/2,792.75 = 765.93/x
  3. Step 3: Cross multiply
    1,861.81x = 2,792.75 × 765.93
  4. Step 4: Simplify right side
    1,861.81x = 2,139,051.01
  5. Step 5: Solve for x
    x = 2,139,051.01/1,861.81
  6. Step 6: Final answer
    x = 1,148.91

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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.