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Finding the Fourth Proportional to 826.44, 1,240.16 and 393.60

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Solution

The fourth proportional to 826.44, 1,240.16 and 393.60 is: 590.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.44 : 1,240.16 = 393.60 : x
  2. Step 2: Convert to fraction form
    826.44/1,240.16 = 393.60/x
  3. Step 3: Cross multiply
    826.44x = 1,240.16 × 393.60
  4. Step 4: Simplify right side
    826.44x = 488,126.98
  5. Step 5: Solve for x
    x = 488,126.98/826.44
  6. Step 6: Final answer
    x = 590.64

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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.