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Finding the Fourth Proportional to 831.27, 1,247.20 and 369.01

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Solution

The fourth proportional to 831.27, 1,247.20 and 369.01 is: 553.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.27 : 1,247.20 = 369.01 : x
  2. Step 2: Convert to fraction form
    831.27/1,247.20 = 369.01/x
  3. Step 3: Cross multiply
    831.27x = 1,247.20 × 369.01
  4. Step 4: Simplify right side
    831.27x = 460,222.89
  5. Step 5: Solve for x
    x = 460,222.89/831.27
  6. Step 6: Final answer
    x = 553.64

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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.