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Finding the Fourth Proportional to 722.13, 1,080.99 and 396.51

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Solution

The fourth proportional to 722.13, 1,080.99 and 396.51 is: 593.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.13 : 1,080.99 = 396.51 : x
  2. Step 2: Convert to fraction form
    722.13/1,080.99 = 396.51/x
  3. Step 3: Cross multiply
    722.13x = 1,080.99 × 396.51
  4. Step 4: Simplify right side
    722.13x = 428,623.34
  5. Step 5: Solve for x
    x = 428,623.34/722.13
  6. Step 6: Final answer
    x = 593.55

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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.