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Finding the Fourth Proportional to 625.95, 863.51 and 405.09

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Solution

The fourth proportional to 625.95, 863.51 and 405.09 is: 558.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.95 : 863.51 = 405.09 : x
  2. Step 2: Convert to fraction form
    625.95/863.51 = 405.09/x
  3. Step 3: Cross multiply
    625.95x = 863.51 × 405.09
  4. Step 4: Simplify right side
    625.95x = 349,797.24
  5. Step 5: Solve for x
    x = 349,797.24/625.95
  6. Step 6: Final answer
    x = 558.83

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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.