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Finding the Fourth Proportional to 684.05, 943.75 and 389.10

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Solution

The fourth proportional to 684.05, 943.75 and 389.10 is: 536.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.05 : 943.75 = 389.10 : x
  2. Step 2: Convert to fraction form
    684.05/943.75 = 389.10/x
  3. Step 3: Cross multiply
    684.05x = 943.75 × 389.10
  4. Step 4: Simplify right side
    684.05x = 367,217.15
  5. Step 5: Solve for x
    x = 367,217.15/684.05
  6. Step 6: Final answer
    x = 536.83

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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.