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Finding the Fourth Proportional to 609.43, 842.15 and 498.87

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Solution

The fourth proportional to 609.43, 842.15 and 498.87 is: 689.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.43 : 842.15 = 498.87 : x
  2. Step 2: Convert to fraction form
    609.43/842.15 = 498.87/x
  3. Step 3: Cross multiply
    609.43x = 842.15 × 498.87
  4. Step 4: Simplify right side
    609.43x = 420,123.37
  5. Step 5: Solve for x
    x = 420,123.37/609.43
  6. Step 6: Final answer
    x = 689.37

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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.