Home / 21,785.96-30,063.20-12,831.72

Finding the Fourth Proportional to 21,785.96, 30,063.20 and 12,831.72

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Solution

The fourth proportional to 21,785.96, 30,063.20 and 12,831.72 is: 17,706.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,785.96 : 30,063.20 = 12,831.72 : x
  2. Step 2: Convert to fraction form
    21,785.96/30,063.20 = 12,831.72/x
  3. Step 3: Cross multiply
    21,785.96x = 30,063.20 × 12,831.72
  4. Step 4: Simplify right side
    21,785.96x = 385,762,564.70
  5. Step 5: Solve for x
    x = 385,762,564.70/21,785.96
  6. Step 6: Final answer
    x = 17,706.93

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1.5x scale

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.