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Finding the Fourth Proportional to 1,687.92, 2,329.50 and 989.28

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Solution

The fourth proportional to 1,687.92, 2,329.50 and 989.28 is: 1,365.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.92 : 2,329.50 = 989.28 : x
  2. Step 2: Convert to fraction form
    1,687.92/2,329.50 = 989.28/x
  3. Step 3: Cross multiply
    1,687.92x = 2,329.50 × 989.28
  4. Step 4: Simplify right side
    1,687.92x = 2,304,527.76
  5. Step 5: Solve for x
    x = 2,304,527.76/1,687.92
  6. Step 6: Final answer
    x = 1,365.31

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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.