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Finding the Fourth Proportional to 782.31, 1,173.21 and 262.20

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Solution

The fourth proportional to 782.31, 1,173.21 and 262.20 is: 393.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.31 : 1,173.21 = 262.20 : x
  2. Step 2: Convert to fraction form
    782.31/1,173.21 = 262.20/x
  3. Step 3: Cross multiply
    782.31x = 1,173.21 × 262.20
  4. Step 4: Simplify right side
    782.31x = 307,615.66
  5. Step 5: Solve for x
    x = 307,615.66/782.31
  6. Step 6: Final answer
    x = 393.21

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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.