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Finding the Fourth Proportional to 982.05, 1,355.18 and 539.87

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Solution

The fourth proportional to 982.05, 1,355.18 and 539.87 is: 744.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.05 : 1,355.18 = 539.87 : x
  2. Step 2: Convert to fraction form
    982.05/1,355.18 = 539.87/x
  3. Step 3: Cross multiply
    982.05x = 1,355.18 × 539.87
  4. Step 4: Simplify right side
    982.05x = 731,621.72
  5. Step 5: Solve for x
    x = 731,621.72/982.05
  6. Step 6: Final answer
    x = 744.99

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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.