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Finding the Fourth Proportional to 609.40, 914.22 and 426.84

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Solution

The fourth proportional to 609.40, 914.22 and 426.84 is: 640.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.40 : 914.22 = 426.84 : x
  2. Step 2: Convert to fraction form
    609.40/914.22 = 426.84/x
  3. Step 3: Cross multiply
    609.40x = 914.22 × 426.84
  4. Step 4: Simplify right side
    609.40x = 390,225.66
  5. Step 5: Solve for x
    x = 390,225.66/609.40
  6. Step 6: Final answer
    x = 640.34

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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.