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Finding the Fourth Proportional to 827.80, 1,239.90 and 553.48

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Solution

The fourth proportional to 827.80, 1,239.90 and 553.48 is: 829.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.80 : 1,239.90 = 553.48 : x
  2. Step 2: Convert to fraction form
    827.80/1,239.90 = 553.48/x
  3. Step 3: Cross multiply
    827.80x = 1,239.90 × 553.48
  4. Step 4: Simplify right side
    827.80x = 686,259.85
  5. Step 5: Solve for x
    x = 686,259.85/827.80
  6. Step 6: Final answer
    x = 829.02

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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.