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Finding the Fourth Proportional to 1,082.75, 1,623.19 and 919.29

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Solution

The fourth proportional to 1,082.75, 1,623.19 and 919.29 is: 1,378.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,082.75 : 1,623.19 = 919.29 : x
  2. Step 2: Convert to fraction form
    1,082.75/1,623.19 = 919.29/x
  3. Step 3: Cross multiply
    1,082.75x = 1,623.19 × 919.29
  4. Step 4: Simplify right side
    1,082.75x = 1,492,182.34
  5. Step 5: Solve for x
    x = 1,492,182.34/1,082.75
  6. Step 6: Final answer
    x = 1,378.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.