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Finding the Fourth Proportional to 827.30, 1,239.90 and 416.55

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Solution

The fourth proportional to 827.30, 1,239.90 and 416.55 is: 624.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.30 : 1,239.90 = 416.55 : x
  2. Step 2: Convert to fraction form
    827.30/1,239.90 = 416.55/x
  3. Step 3: Cross multiply
    827.30x = 1,239.90 × 416.55
  4. Step 4: Simplify right side
    827.30x = 516,480.35
  5. Step 5: Solve for x
    x = 516,480.35/827.30
  6. Step 6: Final answer
    x = 624.30

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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.