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Finding the Fourth Proportional to 625.36, 863.40 and 428.80

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Solution

The fourth proportional to 625.36, 863.40 and 428.80 is: 592.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.36 : 863.40 = 428.80 : x
  2. Step 2: Convert to fraction form
    625.36/863.40 = 428.80/x
  3. Step 3: Cross multiply
    625.36x = 863.40 × 428.80
  4. Step 4: Simplify right side
    625.36x = 370,225.92
  5. Step 5: Solve for x
    x = 370,225.92/625.36
  6. Step 6: Final answer
    x = 592.02

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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.