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Finding the Fourth Proportional to 982.55, 1,355.83 and 540.47

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Solution

The fourth proportional to 982.55, 1,355.83 and 540.47 is: 745.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.55 : 1,355.83 = 540.47 : x
  2. Step 2: Convert to fraction form
    982.55/1,355.83 = 540.47/x
  3. Step 3: Cross multiply
    982.55x = 1,355.83 × 540.47
  4. Step 4: Simplify right side
    982.55x = 732,785.44
  5. Step 5: Solve for x
    x = 732,785.44/982.55
  6. Step 6: Final answer
    x = 745.80

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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.