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Finding the Fourth Proportional to 721.47, 1,080.84 and 355.83

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Solution

The fourth proportional to 721.47, 1,080.84 and 355.83 is: 533.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.47 : 1,080.84 = 355.83 : x
  2. Step 2: Convert to fraction form
    721.47/1,080.84 = 355.83/x
  3. Step 3: Cross multiply
    721.47x = 1,080.84 × 355.83
  4. Step 4: Simplify right side
    721.47x = 384,589.00
  5. Step 5: Solve for x
    x = 384,589.00/721.47
  6. Step 6: Final answer
    x = 533.07

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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.