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Finding the Fourth Proportional to 721.02, 994.68 and 455.34

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Solution

The fourth proportional to 721.02, 994.68 and 455.34 is: 628.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.02 : 994.68 = 455.34 : x
  2. Step 2: Convert to fraction form
    721.02/994.68 = 455.34/x
  3. Step 3: Cross multiply
    721.02x = 994.68 × 455.34
  4. Step 4: Simplify right side
    721.02x = 452,917.59
  5. Step 5: Solve for x
    x = 452,917.59/721.02
  6. Step 6: Final answer
    x = 628.16

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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.