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Finding the Fourth Proportional to 842.00, 1,261.64 and 379.69

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Solution

The fourth proportional to 842.00, 1,261.64 and 379.69 is: 568.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.00 : 1,261.64 = 379.69 : x
  2. Step 2: Convert to fraction form
    842.00/1,261.64 = 379.69/x
  3. Step 3: Cross multiply
    842.00x = 1,261.64 × 379.69
  4. Step 4: Simplify right side
    842.00x = 479,029.89
  5. Step 5: Solve for x
    x = 479,029.89/842.00
  6. Step 6: Final answer
    x = 568.92

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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.