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Finding the Fourth Proportional to 694.80, 1,040.53 and 386.23

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Solution

The fourth proportional to 694.80, 1,040.53 and 386.23 is: 578.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.80 : 1,040.53 = 386.23 : x
  2. Step 2: Convert to fraction form
    694.80/1,040.53 = 386.23/x
  3. Step 3: Cross multiply
    694.80x = 1,040.53 × 386.23
  4. Step 4: Simplify right side
    694.80x = 401,882.81
  5. Step 5: Solve for x
    x = 401,882.81/694.80
  6. Step 6: Final answer
    x = 578.42

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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.