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Finding the Fourth Proportional to 625.59, 863.19 and 389.48

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Solution

The fourth proportional to 625.59, 863.19 and 389.48 is: 537.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.59 : 863.19 = 389.48 : x
  2. Step 2: Convert to fraction form
    625.59/863.19 = 389.48/x
  3. Step 3: Cross multiply
    625.59x = 863.19 × 389.48
  4. Step 4: Simplify right side
    625.59x = 336,190.93
  5. Step 5: Solve for x
    x = 336,190.93/625.59
  6. Step 6: Final answer
    x = 537.40

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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.