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Finding the Fourth Proportional to 645.92, 891.02 and 409.44

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Solution

The fourth proportional to 645.92, 891.02 and 409.44 is: 564.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.92 : 891.02 = 409.44 : x
  2. Step 2: Convert to fraction form
    645.92/891.02 = 409.44/x
  3. Step 3: Cross multiply
    645.92x = 891.02 × 409.44
  4. Step 4: Simplify right side
    645.92x = 364,819.23
  5. Step 5: Solve for x
    x = 364,819.23/645.92
  6. Step 6: Final answer
    x = 564.81

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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.