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Finding the Fourth Proportional to 713.09, 1,069.61 and 422.58

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Solution

The fourth proportional to 713.09, 1,069.61 and 422.58 is: 633.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.09 : 1,069.61 = 422.58 : x
  2. Step 2: Convert to fraction form
    713.09/1,069.61 = 422.58/x
  3. Step 3: Cross multiply
    713.09x = 1,069.61 × 422.58
  4. Step 4: Simplify right side
    713.09x = 451,996.85
  5. Step 5: Solve for x
    x = 451,996.85/713.09
  6. Step 6: Final answer
    x = 633.86

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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.