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Finding the Fourth Proportional to 826.12, 1,239.28 and 278.34

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Solution

The fourth proportional to 826.12, 1,239.28 and 278.34 is: 417.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.12 : 1,239.28 = 278.34 : x
  2. Step 2: Convert to fraction form
    826.12/1,239.28 = 278.34/x
  3. Step 3: Cross multiply
    826.12x = 1,239.28 × 278.34
  4. Step 4: Simplify right side
    826.12x = 344,941.20
  5. Step 5: Solve for x
    x = 344,941.20/826.12
  6. Step 6: Final answer
    x = 417.54

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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.