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Finding the Fourth Proportional to 982.31, 1,355.51 and 562.56

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Solution

The fourth proportional to 982.31, 1,355.51 and 562.56 is: 776.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.31 : 1,355.51 = 562.56 : x
  2. Step 2: Convert to fraction form
    982.31/1,355.51 = 562.56/x
  3. Step 3: Cross multiply
    982.31x = 1,355.51 × 562.56
  4. Step 4: Simplify right side
    982.31x = 762,546.12
  5. Step 5: Solve for x
    x = 762,546.12/982.31
  6. Step 6: Final answer
    x = 776.28

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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.