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Finding the Fourth Proportional to 831.99, 1,247.72 and 393.18

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Solution

The fourth proportional to 831.99, 1,247.72 and 393.18 is: 589.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.99 : 1,247.72 = 393.18 : x
  2. Step 2: Convert to fraction form
    831.99/1,247.72 = 393.18/x
  3. Step 3: Cross multiply
    831.99x = 1,247.72 × 393.18
  4. Step 4: Simplify right side
    831.99x = 490,576.58
  5. Step 5: Solve for x
    x = 490,576.58/831.99
  6. Step 6: Final answer
    x = 589.64

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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.