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Finding the Fourth Proportional to 828.51, 1,243.67 and 438.99

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Solution

The fourth proportional to 828.51, 1,243.67 and 438.99 is: 658.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.51 : 1,243.67 = 438.99 : x
  2. Step 2: Convert to fraction form
    828.51/1,243.67 = 438.99/x
  3. Step 3: Cross multiply
    828.51x = 1,243.67 × 438.99
  4. Step 4: Simplify right side
    828.51x = 545,956.50
  5. Step 5: Solve for x
    x = 545,956.50/828.51
  6. Step 6: Final answer
    x = 658.96

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Double scale
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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.