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Finding the Fourth Proportional to 722.74, 1,085.34 and 685.75

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Solution

The fourth proportional to 722.74, 1,085.34 and 685.75 is: 1,029.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.74 : 1,085.34 = 685.75 : x
  2. Step 2: Convert to fraction form
    722.74/1,085.34 = 685.75/x
  3. Step 3: Cross multiply
    722.74x = 1,085.34 × 685.75
  4. Step 4: Simplify right side
    722.74x = 744,271.91
  5. Step 5: Solve for x
    x = 744,271.91/722.74
  6. Step 6: Final answer
    x = 1,029.79

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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.