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Finding the Fourth Proportional to 684.05, 943.85 and 418.64

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Solution

The fourth proportional to 684.05, 943.85 and 418.64 is: 577.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.05 : 943.85 = 418.64 : x
  2. Step 2: Convert to fraction form
    684.05/943.85 = 418.64/x
  3. Step 3: Cross multiply
    684.05x = 943.85 × 418.64
  4. Step 4: Simplify right side
    684.05x = 395,129.69
  5. Step 5: Solve for x
    x = 395,129.69/684.05
  6. Step 6: Final answer
    x = 577.64

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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.