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Finding the Fourth Proportional to 1,428.68, 2,143.11 and 454.82

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Solution

The fourth proportional to 1,428.68, 2,143.11 and 454.82 is: 682.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.68 : 2,143.11 = 454.82 : x
  2. Step 2: Convert to fraction form
    1,428.68/2,143.11 = 454.82/x
  3. Step 3: Cross multiply
    1,428.68x = 2,143.11 × 454.82
  4. Step 4: Simplify right side
    1,428.68x = 974,729.29
  5. Step 5: Solve for x
    x = 974,729.29/1,428.68
  6. Step 6: Final answer
    x = 682.26

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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.