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Finding the Fourth Proportional to 721.94, 1,080.86 and 477.98

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Solution

The fourth proportional to 721.94, 1,080.86 and 477.98 is: 715.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.94 : 1,080.86 = 477.98 : x
  2. Step 2: Convert to fraction form
    721.94/1,080.86 = 477.98/x
  3. Step 3: Cross multiply
    721.94x = 1,080.86 × 477.98
  4. Step 4: Simplify right side
    721.94x = 516,629.46
  5. Step 5: Solve for x
    x = 516,629.46/721.94
  6. Step 6: Final answer
    x = 715.61

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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.