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Finding the Fourth Proportional to 721.12, 994.72 and 573.28

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Solution

The fourth proportional to 721.12, 994.72 and 573.28 is: 790.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.12 : 994.72 = 573.28 : x
  2. Step 2: Convert to fraction form
    721.12/994.72 = 573.28/x
  3. Step 3: Cross multiply
    721.12x = 994.72 × 573.28
  4. Step 4: Simplify right side
    721.12x = 570,253.08
  5. Step 5: Solve for x
    x = 570,253.08/721.12
  6. Step 6: Final answer
    x = 790.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.