Home / 20,921.74-31,361.40-12,562.61

Finding the Fourth Proportional to 20,921.74, 31,361.40 and 12,562.61

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Solution

The fourth proportional to 20,921.74, 31,361.40 and 12,562.61 is: 18,831.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.74 : 31,361.40 = 12,562.61 : x
  2. Step 2: Convert to fraction form
    20,921.74/31,361.40 = 12,562.61/x
  3. Step 3: Cross multiply
    20,921.74x = 31,361.40 × 12,562.61
  4. Step 4: Simplify right side
    20,921.74x = 393,980,880.45
  5. Step 5: Solve for x
    x = 393,980,880.45/20,921.74
  6. Step 6: Final answer
    x = 18,831.17

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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.