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Finding the Fourth Proportional to 826.60, 1,239.80 and 480.12

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Solution

The fourth proportional to 826.60, 1,239.80 and 480.12 is: 720.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.60 : 1,239.80 = 480.12 : x
  2. Step 2: Convert to fraction form
    826.60/1,239.80 = 480.12/x
  3. Step 3: Cross multiply
    826.60x = 1,239.80 × 480.12
  4. Step 4: Simplify right side
    826.60x = 595,252.78
  5. Step 5: Solve for x
    x = 595,252.78/826.60
  6. Step 6: Final answer
    x = 720.12

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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.