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Finding the Fourth Proportional to 711.83, 1,067.79 and 300.91

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Solution

The fourth proportional to 711.83, 1,067.79 and 300.91 is: 451.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.83 : 1,067.79 = 300.91 : x
  2. Step 2: Convert to fraction form
    711.83/1,067.79 = 300.91/x
  3. Step 3: Cross multiply
    711.83x = 1,067.79 × 300.91
  4. Step 4: Simplify right side
    711.83x = 321,307.18
  5. Step 5: Solve for x
    x = 321,307.18/711.83
  6. Step 6: Final answer
    x = 451.38

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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.