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Finding the Fourth Proportional to 1,871.39, 2,807.08 and 775.78

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Solution

The fourth proportional to 1,871.39, 2,807.08 and 775.78 is: 1,163.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,871.39 : 2,807.08 = 775.78 : x
  2. Step 2: Convert to fraction form
    1,871.39/2,807.08 = 775.78/x
  3. Step 3: Cross multiply
    1,871.39x = 2,807.08 × 775.78
  4. Step 4: Simplify right side
    1,871.39x = 2,177,662.49
  5. Step 5: Solve for x
    x = 2,177,662.49/1,871.39
  6. Step 6: Final answer
    x = 1,163.66

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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.