Home / 20,831.20-31,240.60-11,342

Finding the Fourth Proportional to 20,831.20, 31,240.60 and 11,342

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Solution

The fourth proportional to 20,831.20, 31,240.60 and 11,342 is: 17,009.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,831.20 : 31,240.60 = 11,342 : x
  2. Step 2: Convert to fraction form
    20,831.20/31,240.60 = 11,342/x
  3. Step 3: Cross multiply
    20,831.20x = 31,240.60 × 11,342
  4. Step 4: Simplify right side
    20,831.20x = 354,330,885.20
  5. Step 5: Solve for x
    x = 354,330,885.20/20,831.20
  6. Step 6: Final answer
    x = 17,009.62

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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.