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Finding the Fourth Proportional to 831.37, 1,247.15 and 392.59

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Solution

The fourth proportional to 831.37, 1,247.15 and 392.59 is: 588.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.37 : 1,247.15 = 392.59 : x
  2. Step 2: Convert to fraction form
    831.37/1,247.15 = 392.59/x
  3. Step 3: Cross multiply
    831.37x = 1,247.15 × 392.59
  4. Step 4: Simplify right side
    831.37x = 489,618.62
  5. Step 5: Solve for x
    x = 489,618.62/831.37
  6. Step 6: Final answer
    x = 588.93

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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.