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Finding the Fourth Proportional to 831.56, 1,245.51 and 814.95

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Solution

The fourth proportional to 831.56, 1,245.51 and 814.95 is: 1,220.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.56 : 1,245.51 = 814.95 : x
  2. Step 2: Convert to fraction form
    831.56/1,245.51 = 814.95/x
  3. Step 3: Cross multiply
    831.56x = 1,245.51 × 814.95
  4. Step 4: Simplify right side
    831.56x = 1,015,028.37
  5. Step 5: Solve for x
    x = 1,015,028.37/831.56
  6. Step 6: Final answer
    x = 1,220.64

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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.