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Finding the Fourth Proportional to 831.59, 1,246.70 and 392.62

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Solution

The fourth proportional to 831.59, 1,246.70 and 392.62 is: 588.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.59 : 1,246.70 = 392.62 : x
  2. Step 2: Convert to fraction form
    831.59/1,246.70 = 392.62/x
  3. Step 3: Cross multiply
    831.59x = 1,246.70 × 392.62
  4. Step 4: Simplify right side
    831.59x = 489,479.35
  5. Step 5: Solve for x
    x = 489,479.35/831.59
  6. Step 6: Final answer
    x = 588.61

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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.