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Finding the Fourth Proportional to 725.72, 1,087.30 and 451.40

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Solution

The fourth proportional to 725.72, 1,087.30 and 451.40 is: 676.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.72 : 1,087.30 = 451.40 : x
  2. Step 2: Convert to fraction form
    725.72/1,087.30 = 451.40/x
  3. Step 3: Cross multiply
    725.72x = 1,087.30 × 451.40
  4. Step 4: Simplify right side
    725.72x = 490,804.96
  5. Step 5: Solve for x
    x = 490,804.96/725.72
  6. Step 6: Final answer
    x = 676.30

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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.