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Finding the Fourth Proportional to 722.22, 1,080.62 and 428.65

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Solution

The fourth proportional to 722.22, 1,080.62 and 428.65 is: 641.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.22 : 1,080.62 = 428.65 : x
  2. Step 2: Convert to fraction form
    722.22/1,080.62 = 428.65/x
  3. Step 3: Cross multiply
    722.22x = 1,080.62 × 428.65
  4. Step 4: Simplify right side
    722.22x = 463,206.94
  5. Step 5: Solve for x
    x = 463,206.94/722.22
  6. Step 6: Final answer
    x = 641.36

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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.