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Finding the Fourth Proportional to 1,082.60, 1,492.81 and 689.12

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Solution

The fourth proportional to 1,082.60, 1,492.81 and 689.12 is: 950.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,082.60 : 1,492.81 = 689.12 : x
  2. Step 2: Convert to fraction form
    1,082.60/1,492.81 = 689.12/x
  3. Step 3: Cross multiply
    1,082.60x = 1,492.81 × 689.12
  4. Step 4: Simplify right side
    1,082.60x = 1,028,714.32
  5. Step 5: Solve for x
    x = 1,028,714.32/1,082.60
  6. Step 6: Final answer
    x = 950.23

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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.