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Finding the Fourth Proportional to 842.21, 1,259.30 and 768.69

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Solution

The fourth proportional to 842.21, 1,259.30 and 768.69 is: 1,149.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.21 : 1,259.30 = 768.69 : x
  2. Step 2: Convert to fraction form
    842.21/1,259.30 = 768.69/x
  3. Step 3: Cross multiply
    842.21x = 1,259.30 × 768.69
  4. Step 4: Simplify right side
    842.21x = 968,011.32
  5. Step 5: Solve for x
    x = 968,011.32/842.21
  6. Step 6: Final answer
    x = 1,149.37

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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.