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Finding the Fourth Proportional to 682.32, 939.96 and 640.56

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Solution

The fourth proportional to 682.32, 939.96 and 640.56 is: 882.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.32 : 939.96 = 640.56 : x
  2. Step 2: Convert to fraction form
    682.32/939.96 = 640.56/x
  3. Step 3: Cross multiply
    682.32x = 939.96 × 640.56
  4. Step 4: Simplify right side
    682.32x = 602,100.78
  5. Step 5: Solve for x
    x = 602,100.78/682.32
  6. Step 6: Final answer
    x = 882.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.