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Finding the Fourth Proportional to 625.68, 863.69 and 389.69

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Solution

The fourth proportional to 625.68, 863.69 and 389.69 is: 537.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.68 : 863.69 = 389.69 : x
  2. Step 2: Convert to fraction form
    625.68/863.69 = 389.69/x
  3. Step 3: Cross multiply
    625.68x = 863.69 × 389.69
  4. Step 4: Simplify right side
    625.68x = 336,571.36
  5. Step 5: Solve for x
    x = 336,571.36/625.68
  6. Step 6: Final answer
    x = 537.93

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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.