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Finding the Fourth Proportional to 826.21, 1,239.68 and 548.67

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Solution

The fourth proportional to 826.21, 1,239.68 and 548.67 is: 823.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.21 : 1,239.68 = 548.67 : x
  2. Step 2: Convert to fraction form
    826.21/1,239.68 = 548.67/x
  3. Step 3: Cross multiply
    826.21x = 1,239.68 × 548.67
  4. Step 4: Simplify right side
    826.21x = 680,175.23
  5. Step 5: Solve for x
    x = 680,175.23/826.21
  6. Step 6: Final answer
    x = 823.25

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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.