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Finding the Fourth Proportional to 826.58, 1,239.56 and 306.45

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Solution

The fourth proportional to 826.58, 1,239.56 and 306.45 is: 459.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.58 : 1,239.56 = 306.45 : x
  2. Step 2: Convert to fraction form
    826.58/1,239.56 = 306.45/x
  3. Step 3: Cross multiply
    826.58x = 1,239.56 × 306.45
  4. Step 4: Simplify right side
    826.58x = 379,861.63
  5. Step 5: Solve for x
    x = 379,861.63/826.58
  6. Step 6: Final answer
    x = 459.56

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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.