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Finding the Fourth Proportional to 711.84, 1,067.20 and 300.96

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Solution

The fourth proportional to 711.84, 1,067.20 and 300.96 is: 451.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.84 : 1,067.20 = 300.96 : x
  2. Step 2: Convert to fraction form
    711.84/1,067.20 = 300.96/x
  3. Step 3: Cross multiply
    711.84x = 1,067.20 × 300.96
  4. Step 4: Simplify right side
    711.84x = 321,184.51
  5. Step 5: Solve for x
    x = 321,184.51/711.84
  6. Step 6: Final answer
    x = 451.20

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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.