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Finding the Fourth Proportional to 789.92, 1,090.09 and 458.54

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Solution

The fourth proportional to 789.92, 1,090.09 and 458.54 is: 632.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.92 : 1,090.09 = 458.54 : x
  2. Step 2: Convert to fraction form
    789.92/1,090.09 = 458.54/x
  3. Step 3: Cross multiply
    789.92x = 1,090.09 × 458.54
  4. Step 4: Simplify right side
    789.92x = 499,849.08
  5. Step 5: Solve for x
    x = 499,849.08/789.92
  6. Step 6: Final answer
    x = 632.79

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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.