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Finding the Fourth Proportional to 682.38, 1,021.98 and 438.18

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Solution

The fourth proportional to 682.38, 1,021.98 and 438.18 is: 656.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.38 : 1,021.98 = 438.18 : x
  2. Step 2: Convert to fraction form
    682.38/1,021.98 = 438.18/x
  3. Step 3: Cross multiply
    682.38x = 1,021.98 × 438.18
  4. Step 4: Simplify right side
    682.38x = 447,811.20
  5. Step 5: Solve for x
    x = 447,811.20/682.38
  6. Step 6: Final answer
    x = 656.25

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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.