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Finding the Fourth Proportional to 1,074.24, 1,613.04 and 685.44

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Solution

The fourth proportional to 1,074.24, 1,613.04 and 685.44 is: 1,029.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,074.24 : 1,613.04 = 685.44 : x
  2. Step 2: Convert to fraction form
    1,074.24/1,613.04 = 685.44/x
  3. Step 3: Cross multiply
    1,074.24x = 1,613.04 × 685.44
  4. Step 4: Simplify right side
    1,074.24x = 1,105,642.14
  5. Step 5: Solve for x
    x = 1,105,642.14/1,074.24
  6. Step 6: Final answer
    x = 1,029.23

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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.