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Finding the Fourth Proportional to 1,082.68, 1,493.88 and 640.64

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Solution

The fourth proportional to 1,082.68, 1,493.88 and 640.64 is: 883.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,082.68 : 1,493.88 = 640.64 : x
  2. Step 2: Convert to fraction form
    1,082.68/1,493.88 = 640.64/x
  3. Step 3: Cross multiply
    1,082.68x = 1,493.88 × 640.64
  4. Step 4: Simplify right side
    1,082.68x = 957,039.28
  5. Step 5: Solve for x
    x = 957,039.28/1,082.68
  6. Step 6: Final answer
    x = 883.95

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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.