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Finding the Fourth Proportional to 625.64, 863.27 and 389.65

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Solution

The fourth proportional to 625.64, 863.27 and 389.65 is: 537.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.64 : 863.27 = 389.65 : x
  2. Step 2: Convert to fraction form
    625.64/863.27 = 389.65/x
  3. Step 3: Cross multiply
    625.64x = 863.27 × 389.65
  4. Step 4: Simplify right side
    625.64x = 336,373.16
  5. Step 5: Solve for x
    x = 336,373.16/625.64
  6. Step 6: Final answer
    x = 537.65

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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.