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Finding the Fourth Proportional to 711.15, 1,067.21 and 436.40

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Solution

The fourth proportional to 711.15, 1,067.21 and 436.40 is: 654.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.15 : 1,067.21 = 436.40 : x
  2. Step 2: Convert to fraction form
    711.15/1,067.21 = 436.40/x
  3. Step 3: Cross multiply
    711.15x = 1,067.21 × 436.40
  4. Step 4: Simplify right side
    711.15x = 465,734.72
  5. Step 5: Solve for x
    x = 465,734.72/711.15
  6. Step 6: Final answer
    x = 654.90

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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.