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Finding the Fourth Proportional to 609.84, 840.70 and 423.26

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Solution

The fourth proportional to 609.84, 840.70 and 423.26 is: 583.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.84 : 840.70 = 423.26 : x
  2. Step 2: Convert to fraction form
    609.84/840.70 = 423.26/x
  3. Step 3: Cross multiply
    609.84x = 840.70 × 423.26
  4. Step 4: Simplify right side
    609.84x = 355,834.68
  5. Step 5: Solve for x
    x = 355,834.68/609.84
  6. Step 6: Final answer
    x = 583.49

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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.