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Finding the Fourth Proportional to 1,323.10, 1,984.92 and 775.36

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Solution

The fourth proportional to 1,323.10, 1,984.92 and 775.36 is: 1,163.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,323.10 : 1,984.92 = 775.36 : x
  2. Step 2: Convert to fraction form
    1,323.10/1,984.92 = 775.36/x
  3. Step 3: Cross multiply
    1,323.10x = 1,984.92 × 775.36
  4. Step 4: Simplify right side
    1,323.10x = 1,539,027.57
  5. Step 5: Solve for x
    x = 1,539,027.57/1,323.10
  6. Step 6: Final answer
    x = 1,163.20

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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.