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Finding the Fourth Proportional to 1,871.63, 2,806.93 and 775.73

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Solution

The fourth proportional to 1,871.63, 2,806.93 and 775.73 is: 1,163.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,871.63 : 2,806.93 = 775.73 : x
  2. Step 2: Convert to fraction form
    1,871.63/2,806.93 = 775.73/x
  3. Step 3: Cross multiply
    1,871.63x = 2,806.93 × 775.73
  4. Step 4: Simplify right side
    1,871.63x = 2,177,419.81
  5. Step 5: Solve for x
    x = 2,177,419.81/1,871.63
  6. Step 6: Final answer
    x = 1,163.38

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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.