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Finding the Fourth Proportional to 721.88, 1,081.70 and 336.68

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Solution

The fourth proportional to 721.88, 1,081.70 and 336.68 is: 504.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.88 : 1,081.70 = 336.68 : x
  2. Step 2: Convert to fraction form
    721.88/1,081.70 = 336.68/x
  3. Step 3: Cross multiply
    721.88x = 1,081.70 × 336.68
  4. Step 4: Simplify right side
    721.88x = 364,186.76
  5. Step 5: Solve for x
    x = 364,186.76/721.88
  6. Step 6: Final answer
    x = 504.50

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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.