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Finding the Fourth Proportional to 982.11, 1,355.57 and 608.87

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Solution

The fourth proportional to 982.11, 1,355.57 and 608.87 is: 840.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.11 : 1,355.57 = 608.87 : x
  2. Step 2: Convert to fraction form
    982.11/1,355.57 = 608.87/x
  3. Step 3: Cross multiply
    982.11x = 1,355.57 × 608.87
  4. Step 4: Simplify right side
    982.11x = 825,356.08
  5. Step 5: Solve for x
    x = 825,356.08/982.11
  6. Step 6: Final answer
    x = 840.39

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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.