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Finding the Fourth Proportional to 20,831.80, 31,255.80 and 9,136.78

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Solution

The fourth proportional to 20,831.80, 31,255.80 and 9,136.78 is: 13,708.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,831.80 : 31,255.80 = 9,136.78 : x
  2. Step 2: Convert to fraction form
    20,831.80/31,255.80 = 9,136.78/x
  3. Step 3: Cross multiply
    20,831.80x = 31,255.80 × 9,136.78
  4. Step 4: Simplify right side
    20,831.80x = 285,577,368.32
  5. Step 5: Solve for x
    x = 285,577,368.32/20,831.80
  6. Step 6: Final answer
    x = 13,708.72

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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.