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Finding the Fourth Proportional to 609.78, 840.76 and 423.43

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Solution

The fourth proportional to 609.78, 840.76 and 423.43 is: 583.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.78 : 840.76 = 423.43 : x
  2. Step 2: Convert to fraction form
    609.78/840.76 = 423.43/x
  3. Step 3: Cross multiply
    609.78x = 840.76 × 423.43
  4. Step 4: Simplify right side
    609.78x = 356,003.01
  5. Step 5: Solve for x
    x = 356,003.01/609.78
  6. Step 6: Final answer
    x = 583.82

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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.