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Finding the Fourth Proportional to 693.74, 1,040.21 and 282.39

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Solution

The fourth proportional to 693.74, 1,040.21 and 282.39 is: 423.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.74 : 1,040.21 = 282.39 : x
  2. Step 2: Convert to fraction form
    693.74/1,040.21 = 282.39/x
  3. Step 3: Cross multiply
    693.74x = 1,040.21 × 282.39
  4. Step 4: Simplify right side
    693.74x = 293,744.90
  5. Step 5: Solve for x
    x = 293,744.90/693.74
  6. Step 6: Final answer
    x = 423.42

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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.