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Finding the Fourth Proportional to 1,428.78, 2,143.31 and 455.03

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Solution

The fourth proportional to 1,428.78, 2,143.31 and 455.03 is: 682.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.78 : 2,143.31 = 455.03 : x
  2. Step 2: Convert to fraction form
    1,428.78/2,143.31 = 455.03/x
  3. Step 3: Cross multiply
    1,428.78x = 2,143.31 × 455.03
  4. Step 4: Simplify right side
    1,428.78x = 975,257.36
  5. Step 5: Solve for x
    x = 975,257.36/1,428.78
  6. Step 6: Final answer
    x = 682.58

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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.