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Finding the Fourth Proportional to 1,428.86, 2,142.73 and 550.88

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Solution

The fourth proportional to 1,428.86, 2,142.73 and 550.88 is: 826.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.86 : 2,142.73 = 550.88 : x
  2. Step 2: Convert to fraction form
    1,428.86/2,142.73 = 550.88/x
  3. Step 3: Cross multiply
    1,428.86x = 2,142.73 × 550.88
  4. Step 4: Simplify right side
    1,428.86x = 1,180,387.10
  5. Step 5: Solve for x
    x = 1,180,387.10/1,428.86
  6. Step 6: Final answer
    x = 826.10

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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.