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Finding the Fourth Proportional to 625.81, 862.72 and 438.72

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Solution

The fourth proportional to 625.81, 862.72 and 438.72 is: 604.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.81 : 862.72 = 438.72 : x
  2. Step 2: Convert to fraction form
    625.81/862.72 = 438.72/x
  3. Step 3: Cross multiply
    625.81x = 862.72 × 438.72
  4. Step 4: Simplify right side
    625.81x = 378,492.52
  5. Step 5: Solve for x
    x = 378,492.52/625.81
  6. Step 6: Final answer
    x = 604.80

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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.