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Finding the Fourth Proportional to 1,428.78, 2,143.31 and 994.89

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Solution

The fourth proportional to 1,428.78, 2,143.31 and 994.89 is: 1,492.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.78 : 2,143.31 = 994.89 : x
  2. Step 2: Convert to fraction form
    1,428.78/2,143.31 = 994.89/x
  3. Step 3: Cross multiply
    1,428.78x = 2,143.31 × 994.89
  4. Step 4: Simplify right side
    1,428.78x = 2,132,352.71
  5. Step 5: Solve for x
    x = 2,132,352.71/1,428.78
  6. Step 6: Final answer
    x = 1,492.43

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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.