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Finding the Fourth Proportional to 1,057.72, 1,586.58 and 327.28

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Solution

The fourth proportional to 1,057.72, 1,586.58 and 327.28 is: 490.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,057.72 : 1,586.58 = 327.28 : x
  2. Step 2: Convert to fraction form
    1,057.72/1,586.58 = 327.28/x
  3. Step 3: Cross multiply
    1,057.72x = 1,586.58 × 327.28
  4. Step 4: Simplify right side
    1,057.72x = 519,255.90
  5. Step 5: Solve for x
    x = 519,255.90/1,057.72
  6. Step 6: Final answer
    x = 490.92

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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.