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Finding the Fourth Proportional to 782.36, 1,172.80 and 269

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Solution

The fourth proportional to 782.36, 1,172.80 and 269 is: 403.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.36 : 1,172.80 = 269 : x
  2. Step 2: Convert to fraction form
    782.36/1,172.80 = 269/x
  3. Step 3: Cross multiply
    782.36x = 1,172.80 × 269
  4. Step 4: Simplify right side
    782.36x = 315,483.20
  5. Step 5: Solve for x
    x = 315,483.20/782.36
  6. Step 6: Final answer
    x = 403.25

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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.