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Finding the Fourth Proportional to 826.61, 1,240.04 and 393.75

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Solution

The fourth proportional to 826.61, 1,240.04 and 393.75 is: 590.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.61 : 1,240.04 = 393.75 : x
  2. Step 2: Convert to fraction form
    826.61/1,240.04 = 393.75/x
  3. Step 3: Cross multiply
    826.61x = 1,240.04 × 393.75
  4. Step 4: Simplify right side
    826.61x = 488,266.73
  5. Step 5: Solve for x
    x = 488,266.73/826.61
  6. Step 6: Final answer
    x = 590.69

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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.