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Finding the Fourth Proportional to 1,291.27, 1,936.80 and 469.73

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Solution

The fourth proportional to 1,291.27, 1,936.80 and 469.73 is: 704.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.27 : 1,936.80 = 469.73 : x
  2. Step 2: Convert to fraction form
    1,291.27/1,936.80 = 469.73/x
  3. Step 3: Cross multiply
    1,291.27x = 1,936.80 × 469.73
  4. Step 4: Simplify right side
    1,291.27x = 909,768.33
  5. Step 5: Solve for x
    x = 909,768.33/1,291.27
  6. Step 6: Final answer
    x = 704.55

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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.