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Finding the Fourth Proportional to 682.40, 1,021.71 and 438.32

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Solution

The fourth proportional to 682.40, 1,021.71 and 438.32 is: 656.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.40 : 1,021.71 = 438.32 : x
  2. Step 2: Convert to fraction form
    682.40/1,021.71 = 438.32/x
  3. Step 3: Cross multiply
    682.40x = 1,021.71 × 438.32
  4. Step 4: Simplify right side
    682.40x = 447,835.93
  5. Step 5: Solve for x
    x = 447,835.93/682.40
  6. Step 6: Final answer
    x = 656.27

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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.