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Finding the Fourth Proportional to 987.23, 1,361.46 and 721.25

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Solution

The fourth proportional to 987.23, 1,361.46 and 721.25 is: 994.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.23 : 1,361.46 = 721.25 : x
  2. Step 2: Convert to fraction form
    987.23/1,361.46 = 721.25/x
  3. Step 3: Cross multiply
    987.23x = 1,361.46 × 721.25
  4. Step 4: Simplify right side
    987.23x = 981,946.22
  5. Step 5: Solve for x
    x = 981,946.22/987.23
  6. Step 6: Final answer
    x = 994.65

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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.