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Finding the Fourth Proportional to 827.70, 1,239.12 and 480.21

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Solution

The fourth proportional to 827.70, 1,239.12 and 480.21 is: 718.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.70 : 1,239.12 = 480.21 : x
  2. Step 2: Convert to fraction form
    827.70/1,239.12 = 480.21/x
  3. Step 3: Cross multiply
    827.70x = 1,239.12 × 480.21
  4. Step 4: Simplify right side
    827.70x = 595,037.82
  5. Step 5: Solve for x
    x = 595,037.82/827.70
  6. Step 6: Final answer
    x = 718.91

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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.