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Finding the Fourth Proportional to 1,639.92, 2,458.11 and 816.56

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Solution

The fourth proportional to 1,639.92, 2,458.11 and 816.56 is: 1,223.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.92 : 2,458.11 = 816.56 : x
  2. Step 2: Convert to fraction form
    1,639.92/2,458.11 = 816.56/x
  3. Step 3: Cross multiply
    1,639.92x = 2,458.11 × 816.56
  4. Step 4: Simplify right side
    1,639.92x = 2,007,194.30
  5. Step 5: Solve for x
    x = 2,007,194.30/1,639.92
  6. Step 6: Final answer
    x = 1,223.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.