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Finding the Fourth Proportional to 682.21, 941.45 and 387.47

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Solution

The fourth proportional to 682.21, 941.45 and 387.47 is: 534.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.21 : 941.45 = 387.47 : x
  2. Step 2: Convert to fraction form
    682.21/941.45 = 387.47/x
  3. Step 3: Cross multiply
    682.21x = 941.45 × 387.47
  4. Step 4: Simplify right side
    682.21x = 364,781.69
  5. Step 5: Solve for x
    x = 364,781.69/682.21
  6. Step 6: Final answer
    x = 534.71

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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.