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Finding the Fourth Proportional to 984.31, 1,356.59 and 869.74

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Solution

The fourth proportional to 984.31, 1,356.59 and 869.74 is: 1,198.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.31 : 1,356.59 = 869.74 : x
  2. Step 2: Convert to fraction form
    984.31/1,356.59 = 869.74/x
  3. Step 3: Cross multiply
    984.31x = 1,356.59 × 869.74
  4. Step 4: Simplify right side
    984.31x = 1,179,879.37
  5. Step 5: Solve for x
    x = 1,179,879.37/984.31
  6. Step 6: Final answer
    x = 1,198.69

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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.