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Finding the Fourth Proportional to 827.64, 1,239.84 and 519.84

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Solution

The fourth proportional to 827.64, 1,239.84 and 519.84 is: 778.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.64 : 1,239.84 = 519.84 : x
  2. Step 2: Convert to fraction form
    827.64/1,239.84 = 519.84/x
  3. Step 3: Cross multiply
    827.64x = 1,239.84 × 519.84
  4. Step 4: Simplify right side
    827.64x = 644,518.43
  5. Step 5: Solve for x
    x = 644,518.43/827.64
  6. Step 6: Final answer
    x = 778.74

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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.