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Finding the Fourth Proportional to 1,871.75, 2,808.12 and 775.83

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Solution

The fourth proportional to 1,871.75, 2,808.12 and 775.83 is: 1,163.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,871.75 : 2,808.12 = 775.83 : x
  2. Step 2: Convert to fraction form
    1,871.75/2,808.12 = 775.83/x
  3. Step 3: Cross multiply
    1,871.75x = 2,808.12 × 775.83
  4. Step 4: Simplify right side
    1,871.75x = 2,178,623.74
  5. Step 5: Solve for x
    x = 2,178,623.74/1,871.75
  6. Step 6: Final answer
    x = 1,163.95

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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.