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Finding the Fourth Proportional to 831.12, 1,246.69 and 392.23

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Solution

The fourth proportional to 831.12, 1,246.69 and 392.23 is: 588.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.12 : 1,246.69 = 392.23 : x
  2. Step 2: Convert to fraction form
    831.12/1,246.69 = 392.23/x
  3. Step 3: Cross multiply
    831.12x = 1,246.69 × 392.23
  4. Step 4: Simplify right side
    831.12x = 488,989.06
  5. Step 5: Solve for x
    x = 488,989.06/831.12
  6. Step 6: Final answer
    x = 588.35

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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.