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Finding the Fourth Proportional to 625.69, 862.53 and 438.61

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Solution

The fourth proportional to 625.69, 862.53 and 438.61 is: 604.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.69 : 862.53 = 438.61 : x
  2. Step 2: Convert to fraction form
    625.69/862.53 = 438.61/x
  3. Step 3: Cross multiply
    625.69x = 862.53 × 438.61
  4. Step 4: Simplify right side
    625.69x = 378,314.28
  5. Step 5: Solve for x
    x = 378,314.28/625.69
  6. Step 6: Final answer
    x = 604.64

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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.