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Finding the Fourth Proportional to 451.31, 675.80 and 386.73

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Solution

The fourth proportional to 451.31, 675.80 and 386.73 is: 579.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.31 : 675.80 = 386.73 : x
  2. Step 2: Convert to fraction form
    451.31/675.80 = 386.73/x
  3. Step 3: Cross multiply
    451.31x = 675.80 × 386.73
  4. Step 4: Simplify right side
    451.31x = 261,352.13
  5. Step 5: Solve for x
    x = 261,352.13/451.31
  6. Step 6: Final answer
    x = 579.10

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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.