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Finding the Fourth Proportional to 1,323.82, 1,827.64 and 989.56

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Solution

The fourth proportional to 1,323.82, 1,827.64 and 989.56 is: 1,366.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,323.82 : 1,827.64 = 989.56 : x
  2. Step 2: Convert to fraction form
    1,323.82/1,827.64 = 989.56/x
  3. Step 3: Cross multiply
    1,323.82x = 1,827.64 × 989.56
  4. Step 4: Simplify right side
    1,323.82x = 1,808,559.44
  5. Step 5: Solve for x
    x = 1,808,559.44/1,323.82
  6. Step 6: Final answer
    x = 1,366.17

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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.