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Finding the Fourth Proportional to 829.45, 1,243.77 and 551.35

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Solution

The fourth proportional to 829.45, 1,243.77 and 551.35 is: 826.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.45 : 1,243.77 = 551.35 : x
  2. Step 2: Convert to fraction form
    829.45/1,243.77 = 551.35/x
  3. Step 3: Cross multiply
    829.45x = 1,243.77 × 551.35
  4. Step 4: Simplify right side
    829.45x = 685,752.59
  5. Step 5: Solve for x
    x = 685,752.59/829.45
  6. Step 6: Final answer
    x = 826.76

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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.