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Finding the Fourth Proportional to 800.72, 1,104.84 and 490

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Solution

The fourth proportional to 800.72, 1,104.84 and 490 is: 676.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.72 : 1,104.84 = 490 : x
  2. Step 2: Convert to fraction form
    800.72/1,104.84 = 490/x
  3. Step 3: Cross multiply
    800.72x = 1,104.84 × 490
  4. Step 4: Simplify right side
    800.72x = 541,371.60
  5. Step 5: Solve for x
    x = 541,371.60/800.72
  6. Step 6: Final answer
    x = 676.11

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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.