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Finding the Fourth Proportional to 982.70, 1,355.79 and 563.06

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Solution

The fourth proportional to 982.70, 1,355.79 and 563.06 is: 776.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.70 : 1,355.79 = 563.06 : x
  2. Step 2: Convert to fraction form
    982.70/1,355.79 = 563.06/x
  3. Step 3: Cross multiply
    982.70x = 1,355.79 × 563.06
  4. Step 4: Simplify right side
    982.70x = 763,391.12
  5. Step 5: Solve for x
    x = 763,391.12/982.70
  6. Step 6: Final answer
    x = 776.83

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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.