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Finding the Fourth Proportional to 1,371.55, 2,057.65 and 447.11

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Solution

The fourth proportional to 1,371.55, 2,057.65 and 447.11 is: 670.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,371.55 : 2,057.65 = 447.11 : x
  2. Step 2: Convert to fraction form
    1,371.55/2,057.65 = 447.11/x
  3. Step 3: Cross multiply
    1,371.55x = 2,057.65 × 447.11
  4. Step 4: Simplify right side
    1,371.55x = 919,995.89
  5. Step 5: Solve for x
    x = 919,995.89/1,371.55
  6. Step 6: Final answer
    x = 670.77

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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.