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Finding the Fourth Proportional to 721.14, 994.61 and 485.01

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Solution

The fourth proportional to 721.14, 994.61 and 485.01 is: 668.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.14 : 994.61 = 485.01 : x
  2. Step 2: Convert to fraction form
    721.14/994.61 = 485.01/x
  3. Step 3: Cross multiply
    721.14x = 994.61 × 485.01
  4. Step 4: Simplify right side
    721.14x = 482,395.80
  5. Step 5: Solve for x
    x = 482,395.80/721.14
  6. Step 6: Final answer
    x = 668.94

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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.