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Finding the Fourth Proportional to 990.88, 1,361.28 and 887.32

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Solution

The fourth proportional to 990.88, 1,361.28 and 887.32 is: 1,219.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.88 : 1,361.28 = 887.32 : x
  2. Step 2: Convert to fraction form
    990.88/1,361.28 = 887.32/x
  3. Step 3: Cross multiply
    990.88x = 1,361.28 × 887.32
  4. Step 4: Simplify right side
    990.88x = 1,207,890.97
  5. Step 5: Solve for x
    x = 1,207,890.97/990.88
  6. Step 6: Final answer
    x = 1,219.01

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.