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Finding the Fourth Proportional to 721.17, 995.31 and 546.21

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Solution

The fourth proportional to 721.17, 995.31 and 546.21 is: 753.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.17 : 995.31 = 546.21 : x
  2. Step 2: Convert to fraction form
    721.17/995.31 = 546.21/x
  3. Step 3: Cross multiply
    721.17x = 995.31 × 546.21
  4. Step 4: Simplify right side
    721.17x = 543,648.28
  5. Step 5: Solve for x
    x = 543,648.28/721.17
  6. Step 6: Final answer
    x = 753.84

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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.