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Finding the Fourth Proportional to 625.11, 863.49 and 428.28

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Solution

The fourth proportional to 625.11, 863.49 and 428.28 is: 591.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.11 : 863.49 = 428.28 : x
  2. Step 2: Convert to fraction form
    625.11/863.49 = 428.28/x
  3. Step 3: Cross multiply
    625.11x = 863.49 × 428.28
  4. Step 4: Simplify right side
    625.11x = 369,815.50
  5. Step 5: Solve for x
    x = 369,815.50/625.11
  6. Step 6: Final answer
    x = 591.60

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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.