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Finding the Fourth Proportional to 3,128.28, 4,317 and 1,731

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Solution

The fourth proportional to 3,128.28, 4,317 and 1,731 is: 2,388.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,128.28 : 4,317 = 1,731 : x
  2. Step 2: Convert to fraction form
    3,128.28/4,317 = 1,731/x
  3. Step 3: Cross multiply
    3,128.28x = 4,317 × 1,731
  4. Step 4: Simplify right side
    3,128.28x = 7,472,727
  5. Step 5: Solve for x
    x = 7,472,727/3,128.28
  6. Step 6: Final answer
    x = 2,388.77

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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.