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Finding the Fourth Proportional to 721.22, 1,081.67 and 351.02

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Solution

The fourth proportional to 721.22, 1,081.67 and 351.02 is: 526.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.22 : 1,081.67 = 351.02 : x
  2. Step 2: Convert to fraction form
    721.22/1,081.67 = 351.02/x
  3. Step 3: Cross multiply
    721.22x = 1,081.67 × 351.02
  4. Step 4: Simplify right side
    721.22x = 379,684.64
  5. Step 5: Solve for x
    x = 379,684.64/721.22
  6. Step 6: Final answer
    x = 526.45

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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.