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Finding the Fourth Proportional to 826.88, 1,240.64 and 394.08

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Solution

The fourth proportional to 826.88, 1,240.64 and 394.08 is: 591.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.88 : 1,240.64 = 394.08 : x
  2. Step 2: Convert to fraction form
    826.88/1,240.64 = 394.08/x
  3. Step 3: Cross multiply
    826.88x = 1,240.64 × 394.08
  4. Step 4: Simplify right side
    826.88x = 488,911.41
  5. Step 5: Solve for x
    x = 488,911.41/826.88
  6. Step 6: Final answer
    x = 591.27

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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.