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Finding the Fourth Proportional to 831.34, 1,245.36 and 763.30

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Solution

The fourth proportional to 831.34, 1,245.36 and 763.30 is: 1,143.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.34 : 1,245.36 = 763.30 : x
  2. Step 2: Convert to fraction form
    831.34/1,245.36 = 763.30/x
  3. Step 3: Cross multiply
    831.34x = 1,245.36 × 763.30
  4. Step 4: Simplify right side
    831.34x = 950,583.29
  5. Step 5: Solve for x
    x = 950,583.29/831.34
  6. Step 6: Final answer
    x = 1,143.44

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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.