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Finding the Fourth Proportional to 693.74, 1,040.45 and 328.33

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Solution

The fourth proportional to 693.74, 1,040.45 and 328.33 is: 492.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.74 : 1,040.45 = 328.33 : x
  2. Step 2: Convert to fraction form
    693.74/1,040.45 = 328.33/x
  3. Step 3: Cross multiply
    693.74x = 1,040.45 × 328.33
  4. Step 4: Simplify right side
    693.74x = 341,608.28
  5. Step 5: Solve for x
    x = 341,608.28/693.74
  6. Step 6: Final answer
    x = 492.42

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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.