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Finding the Fourth Proportional to 1,447.92, 1,998.36 and 1,385.64

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Solution

The fourth proportional to 1,447.92, 1,998.36 and 1,385.64 is: 1,912.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,447.92 : 1,998.36 = 1,385.64 : x
  2. Step 2: Convert to fraction form
    1,447.92/1,998.36 = 1,385.64/x
  3. Step 3: Cross multiply
    1,447.92x = 1,998.36 × 1,385.64
  4. Step 4: Simplify right side
    1,447.92x = 2,769,007.55
  5. Step 5: Solve for x
    x = 2,769,007.55/1,447.92
  6. Step 6: Final answer
    x = 1,912.40

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1.5x scale

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.