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Finding the Fourth Proportional to 625.78, 939.09 and 433.06

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Solution

The fourth proportional to 625.78, 939.09 and 433.06 is: 649.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.78 : 939.09 = 433.06 : x
  2. Step 2: Convert to fraction form
    625.78/939.09 = 433.06/x
  3. Step 3: Cross multiply
    625.78x = 939.09 × 433.06
  4. Step 4: Simplify right side
    625.78x = 406,682.32
  5. Step 5: Solve for x
    x = 406,682.32/625.78
  6. Step 6: Final answer
    x = 649.88

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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.