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Finding the Fourth Proportional to 1,273.79, 1,911 and 408.11

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Solution

The fourth proportional to 1,273.79, 1,911 and 408.11 is: 612.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,273.79 : 1,911 = 408.11 : x
  2. Step 2: Convert to fraction form
    1,273.79/1,911 = 408.11/x
  3. Step 3: Cross multiply
    1,273.79x = 1,911 × 408.11
  4. Step 4: Simplify right side
    1,273.79x = 779,888.66
  5. Step 5: Solve for x
    x = 779,888.66/1,273.79
  6. Step 6: Final answer
    x = 612.26

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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.