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Finding the Fourth Proportional to 826.75, 1,240.17 and 313.75

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Solution

The fourth proportional to 826.75, 1,240.17 and 313.75 is: 470.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.75 : 1,240.17 = 313.75 : x
  2. Step 2: Convert to fraction form
    826.75/1,240.17 = 313.75/x
  3. Step 3: Cross multiply
    826.75x = 1,240.17 × 313.75
  4. Step 4: Simplify right side
    826.75x = 389,103.34
  5. Step 5: Solve for x
    x = 389,103.34/826.75
  6. Step 6: Final answer
    x = 470.64

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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.