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Finding the Fourth Proportional to 826.61, 1,239.18 and 313.97

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Solution

The fourth proportional to 826.61, 1,239.18 and 313.97 is: 470.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.61 : 1,239.18 = 313.97 : x
  2. Step 2: Convert to fraction form
    826.61/1,239.18 = 313.97/x
  3. Step 3: Cross multiply
    826.61x = 1,239.18 × 313.97
  4. Step 4: Simplify right side
    826.61x = 389,065.34
  5. Step 5: Solve for x
    x = 389,065.34/826.61
  6. Step 6: Final answer
    x = 470.68

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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.