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Finding the Fourth Proportional to 725.12, 1,086.72 and 339.68

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Solution

The fourth proportional to 725.12, 1,086.72 and 339.68 is: 509.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.12 : 1,086.72 = 339.68 : x
  2. Step 2: Convert to fraction form
    725.12/1,086.72 = 339.68/x
  3. Step 3: Cross multiply
    725.12x = 1,086.72 × 339.68
  4. Step 4: Simplify right side
    725.12x = 369,137.05
  5. Step 5: Solve for x
    x = 369,137.05/725.12
  6. Step 6: Final answer
    x = 509.07

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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.