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Finding the Fourth Proportional to 982.31, 1,355.50 and 562.59

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Solution

The fourth proportional to 982.31, 1,355.50 and 562.59 is: 776.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.31 : 1,355.50 = 562.59 : x
  2. Step 2: Convert to fraction form
    982.31/1,355.50 = 562.59/x
  3. Step 3: Cross multiply
    982.31x = 1,355.50 × 562.59
  4. Step 4: Simplify right side
    982.31x = 762,590.75
  5. Step 5: Solve for x
    x = 762,590.75/982.31
  6. Step 6: Final answer
    x = 776.32

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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.