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Finding the Fourth Proportional to 982.88, 1,355.64 and 887.84

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Solution

The fourth proportional to 982.88, 1,355.64 and 887.84 is: 1,224.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.88 : 1,355.64 = 887.84 : x
  2. Step 2: Convert to fraction form
    982.88/1,355.64 = 887.84/x
  3. Step 3: Cross multiply
    982.88x = 1,355.64 × 887.84
  4. Step 4: Simplify right side
    982.88x = 1,203,591.42
  5. Step 5: Solve for x
    x = 1,203,591.42/982.88
  6. Step 6: Final answer
    x = 1,224.56

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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.