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Finding the Fourth Proportional to 982.30, 1,355.57 and 540.20

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Solution

The fourth proportional to 982.30, 1,355.57 and 540.20 is: 745.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.30 : 1,355.57 = 540.20 : x
  2. Step 2: Convert to fraction form
    982.30/1,355.57 = 540.20/x
  3. Step 3: Cross multiply
    982.30x = 1,355.57 × 540.20
  4. Step 4: Simplify right side
    982.30x = 732,269.44
  5. Step 5: Solve for x
    x = 732,269.44/982.30
  6. Step 6: Final answer
    x = 745.47

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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.