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Finding the Fourth Proportional to 1,429.55, 2,143.31 and 551.30

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Solution

The fourth proportional to 1,429.55, 2,143.31 and 551.30 is: 826.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,429.55 : 2,143.31 = 551.30 : x
  2. Step 2: Convert to fraction form
    1,429.55/2,143.31 = 551.30/x
  3. Step 3: Cross multiply
    1,429.55x = 2,143.31 × 551.30
  4. Step 4: Simplify right side
    1,429.55x = 1,181,609.40
  5. Step 5: Solve for x
    x = 1,181,609.40/1,429.55
  6. Step 6: Final answer
    x = 826.56

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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.