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Finding the Fourth Proportional to 711.45, 1,067.31 and 642.60

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Solution

The fourth proportional to 711.45, 1,067.31 and 642.60 is: 964.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.45 : 1,067.31 = 642.60 : x
  2. Step 2: Convert to fraction form
    711.45/1,067.31 = 642.60/x
  3. Step 3: Cross multiply
    711.45x = 1,067.31 × 642.60
  4. Step 4: Simplify right side
    711.45x = 685,853.41
  5. Step 5: Solve for x
    x = 685,853.41/711.45
  6. Step 6: Final answer
    x = 964.02

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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.