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Finding the Fourth Proportional to 782.67, 1,080.20 and 488.03

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Solution

The fourth proportional to 782.67, 1,080.20 and 488.03 is: 673.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.67 : 1,080.20 = 488.03 : x
  2. Step 2: Convert to fraction form
    782.67/1,080.20 = 488.03/x
  3. Step 3: Cross multiply
    782.67x = 1,080.20 × 488.03
  4. Step 4: Simplify right side
    782.67x = 527,170.01
  5. Step 5: Solve for x
    x = 527,170.01/782.67
  6. Step 6: Final answer
    x = 673.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.