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Finding the Fourth Proportional to 694.58, 1,040.31 and 386.10

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Solution

The fourth proportional to 694.58, 1,040.31 and 386.10 is: 578.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.58 : 1,040.31 = 386.10 : x
  2. Step 2: Convert to fraction form
    694.58/1,040.31 = 386.10/x
  3. Step 3: Cross multiply
    694.58x = 1,040.31 × 386.10
  4. Step 4: Simplify right side
    694.58x = 401,663.69
  5. Step 5: Solve for x
    x = 401,663.69/694.58
  6. Step 6: Final answer
    x = 578.29

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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.