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Finding the Fourth Proportional to 725.78, 1,089.18 and 355.19

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Solution

The fourth proportional to 725.78, 1,089.18 and 355.19 is: 533.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.78 : 1,089.18 = 355.19 : x
  2. Step 2: Convert to fraction form
    725.78/1,089.18 = 355.19/x
  3. Step 3: Cross multiply
    725.78x = 1,089.18 × 355.19
  4. Step 4: Simplify right side
    725.78x = 386,860.40
  5. Step 5: Solve for x
    x = 386,860.40/725.78
  6. Step 6: Final answer
    x = 533.03

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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.