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Finding the Fourth Proportional to 625.94, 939.22 and 431.24

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Solution

The fourth proportional to 625.94, 939.22 and 431.24 is: 647.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.94 : 939.22 = 431.24 : x
  2. Step 2: Convert to fraction form
    625.94/939.22 = 431.24/x
  3. Step 3: Cross multiply
    625.94x = 939.22 × 431.24
  4. Step 4: Simplify right side
    625.94x = 405,023.46
  5. Step 5: Solve for x
    x = 405,023.46/625.94
  6. Step 6: Final answer
    x = 647.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.