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Finding the Fourth Proportional to 1,082.56, 1,493.96 and 640.46

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Solution

The fourth proportional to 1,082.56, 1,493.96 and 640.46 is: 883.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,082.56 : 1,493.96 = 640.46 : x
  2. Step 2: Convert to fraction form
    1,082.56/1,493.96 = 640.46/x
  3. Step 3: Cross multiply
    1,082.56x = 1,493.96 × 640.46
  4. Step 4: Simplify right side
    1,082.56x = 956,821.62
  5. Step 5: Solve for x
    x = 956,821.62/1,082.56
  6. Step 6: Final answer
    x = 883.85

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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.