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Finding the Fourth Proportional to 684.09, 943.95 and 385.34

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Solution

The fourth proportional to 684.09, 943.95 and 385.34 is: 531.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.09 : 943.95 = 385.34 : x
  2. Step 2: Convert to fraction form
    684.09/943.95 = 385.34/x
  3. Step 3: Cross multiply
    684.09x = 943.95 × 385.34
  4. Step 4: Simplify right side
    684.09x = 363,743.73
  5. Step 5: Solve for x
    x = 363,743.73/684.09
  6. Step 6: Final answer
    x = 531.72

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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.