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Finding the Fourth Proportional to 723.67, 1,084.86 and 261.35

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Solution

The fourth proportional to 723.67, 1,084.86 and 261.35 is: 391.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.67 : 1,084.86 = 261.35 : x
  2. Step 2: Convert to fraction form
    723.67/1,084.86 = 261.35/x
  3. Step 3: Cross multiply
    723.67x = 1,084.86 × 261.35
  4. Step 4: Simplify right side
    723.67x = 283,524.77
  5. Step 5: Solve for x
    x = 283,524.77/723.67
  6. Step 6: Final answer
    x = 391.79

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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.