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Finding the Fourth Proportional to 1,336.72, 1,844.40 and 983.20

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Solution

The fourth proportional to 1,336.72, 1,844.40 and 983.20 is: 1,356.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,336.72 : 1,844.40 = 983.20 : x
  2. Step 2: Convert to fraction form
    1,336.72/1,844.40 = 983.20/x
  3. Step 3: Cross multiply
    1,336.72x = 1,844.40 × 983.20
  4. Step 4: Simplify right side
    1,336.72x = 1,813,414.08
  5. Step 5: Solve for x
    x = 1,813,414.08/1,336.72
  6. Step 6: Final answer
    x = 1,356.61

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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.