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Finding the Fourth Proportional to 782.36, 1,172.79 and 262.07

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Solution

The fourth proportional to 782.36, 1,172.79 and 262.07 is: 392.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.36 : 1,172.79 = 262.07 : x
  2. Step 2: Convert to fraction form
    782.36/1,172.79 = 262.07/x
  3. Step 3: Cross multiply
    782.36x = 1,172.79 × 262.07
  4. Step 4: Simplify right side
    782.36x = 307,353.08
  5. Step 5: Solve for x
    x = 307,353.08/782.36
  6. Step 6: Final answer
    x = 392.85

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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.