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Finding the Fourth Proportional to 1,389.06, 2,082.51 and 763.38

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Solution

The fourth proportional to 1,389.06, 2,082.51 and 763.38 is: 1,144.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.06 : 2,082.51 = 763.38 : x
  2. Step 2: Convert to fraction form
    1,389.06/2,082.51 = 763.38/x
  3. Step 3: Cross multiply
    1,389.06x = 2,082.51 × 763.38
  4. Step 4: Simplify right side
    1,389.06x = 1,589,746.48
  5. Step 5: Solve for x
    x = 1,589,746.48/1,389.06
  6. Step 6: Final answer
    x = 1,144.48

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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.