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Finding the Fourth Proportional to 682.31, 941.55 and 387.56

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Solution

The fourth proportional to 682.31, 941.55 and 387.56 is: 534.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.31 : 941.55 = 387.56 : x
  2. Step 2: Convert to fraction form
    682.31/941.55 = 387.56/x
  3. Step 3: Cross multiply
    682.31x = 941.55 × 387.56
  4. Step 4: Simplify right side
    682.31x = 364,907.12
  5. Step 5: Solve for x
    x = 364,907.12/682.31
  6. Step 6: Final answer
    x = 534.81

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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.