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Finding the Fourth Proportional to 826.75, 1,240.26 and 393.76

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Solution

The fourth proportional to 826.75, 1,240.26 and 393.76 is: 590.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.75 : 1,240.26 = 393.76 : x
  2. Step 2: Convert to fraction form
    826.75/1,240.26 = 393.76/x
  3. Step 3: Cross multiply
    826.75x = 1,240.26 × 393.76
  4. Step 4: Simplify right side
    826.75x = 488,364.78
  5. Step 5: Solve for x
    x = 488,364.78/826.75
  6. Step 6: Final answer
    x = 590.70

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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.