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Finding the Fourth Proportional to 625.85, 938.78 and 431.45

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Solution

The fourth proportional to 625.85, 938.78 and 431.45 is: 647.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.85 : 938.78 = 431.45 : x
  2. Step 2: Convert to fraction form
    625.85/938.78 = 431.45/x
  3. Step 3: Cross multiply
    625.85x = 938.78 × 431.45
  4. Step 4: Simplify right side
    625.85x = 405,034.47
  5. Step 5: Solve for x
    x = 405,034.47/625.85
  6. Step 6: Final answer
    x = 647.18

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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.