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Finding the Fourth Proportional to 725.32, 1,086.78 and 339.88

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Solution

The fourth proportional to 725.32, 1,086.78 and 339.88 is: 509.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.32 : 1,086.78 = 339.88 : x
  2. Step 2: Convert to fraction form
    725.32/1,086.78 = 339.88/x
  3. Step 3: Cross multiply
    725.32x = 1,086.78 × 339.88
  4. Step 4: Simplify right side
    725.32x = 369,374.79
  5. Step 5: Solve for x
    x = 369,374.79/725.32
  6. Step 6: Final answer
    x = 509.26

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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.