Home / 30,921.21-42,706.04-20,831.99

Finding the Fourth Proportional to 30,921.21, 42,706.04 and 20,831.99

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Solution

The fourth proportional to 30,921.21, 42,706.04 and 20,831.99 is: 28,771.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,921.21 : 42,706.04 = 20,831.99 : x
  2. Step 2: Convert to fraction form
    30,921.21/42,706.04 = 20,831.99/x
  3. Step 3: Cross multiply
    30,921.21x = 42,706.04 × 20,831.99
  4. Step 4: Simplify right side
    30,921.21x = 889,651,480.53
  5. Step 5: Solve for x
    x = 889,651,480.53/30,921.21
  6. Step 6: Final answer
    x = 28,771.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.