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Finding the Fourth Proportional to 982.80, 1,355.76 and 872.40

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Solution

The fourth proportional to 982.80, 1,355.76 and 872.40 is: 1,203.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.80 : 1,355.76 = 872.40 : x
  2. Step 2: Convert to fraction form
    982.80/1,355.76 = 872.40/x
  3. Step 3: Cross multiply
    982.80x = 1,355.76 × 872.40
  4. Step 4: Simplify right side
    982.80x = 1,182,765.02
  5. Step 5: Solve for x
    x = 1,182,765.02/982.80
  6. Step 6: Final answer
    x = 1,203.46

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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.