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Finding the Fourth Proportional to 1,082.12, 1,492.26 and 689

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Solution

The fourth proportional to 1,082.12, 1,492.26 and 689 is: 950.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,082.12 : 1,492.26 = 689 : x
  2. Step 2: Convert to fraction form
    1,082.12/1,492.26 = 689/x
  3. Step 3: Cross multiply
    1,082.12x = 1,492.26 × 689
  4. Step 4: Simplify right side
    1,082.12x = 1,028,167.14
  5. Step 5: Solve for x
    x = 1,028,167.14/1,082.12
  6. Step 6: Final answer
    x = 950.14

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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.