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Finding the Fourth Proportional to 1,389.45, 2,082.12 and 608.73

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Solution

The fourth proportional to 1,389.45, 2,082.12 and 608.73 is: 912.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.45 : 2,082.12 = 608.73 : x
  2. Step 2: Convert to fraction form
    1,389.45/2,082.12 = 608.73/x
  3. Step 3: Cross multiply
    1,389.45x = 2,082.12 × 608.73
  4. Step 4: Simplify right side
    1,389.45x = 1,267,448.91
  5. Step 5: Solve for x
    x = 1,267,448.91/1,389.45
  6. Step 6: Final answer
    x = 912.19

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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.