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Finding the Fourth Proportional to 1,082.28, 1,493.01 and 639.75

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Solution

The fourth proportional to 1,082.28, 1,493.01 and 639.75 is: 882.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,082.28 : 1,493.01 = 639.75 : x
  2. Step 2: Convert to fraction form
    1,082.28/1,493.01 = 639.75/x
  3. Step 3: Cross multiply
    1,082.28x = 1,493.01 × 639.75
  4. Step 4: Simplify right side
    1,082.28x = 955,153.15
  5. Step 5: Solve for x
    x = 955,153.15/1,082.28
  6. Step 6: Final answer
    x = 882.54

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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.