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Finding the Fourth Proportional to 725.07, 1,087.20 and 432.62

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Solution

The fourth proportional to 725.07, 1,087.20 and 432.62 is: 648.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.07 : 1,087.20 = 432.62 : x
  2. Step 2: Convert to fraction form
    725.07/1,087.20 = 432.62/x
  3. Step 3: Cross multiply
    725.07x = 1,087.20 × 432.62
  4. Step 4: Simplify right side
    725.07x = 470,339.03
  5. Step 5: Solve for x
    x = 470,339.03/725.07
  6. Step 6: Final answer
    x = 648.68

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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.