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Finding the Fourth Proportional to 625.67, 863.40 and 345.89

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Solution

The fourth proportional to 625.67, 863.40 and 345.89 is: 477.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.67 : 863.40 = 345.89 : x
  2. Step 2: Convert to fraction form
    625.67/863.40 = 345.89/x
  3. Step 3: Cross multiply
    625.67x = 863.40 × 345.89
  4. Step 4: Simplify right side
    625.67x = 298,639.05
  5. Step 5: Solve for x
    x = 298,639.05/625.67
  6. Step 6: Final answer
    x = 477.31

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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.