Home / 21,831.16-30,125.70-12,879

Finding the Fourth Proportional to 21,831.16, 30,125.70 and 12,879

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Solution

The fourth proportional to 21,831.16, 30,125.70 and 12,879 is: 17,772.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,831.16 : 30,125.70 = 12,879 : x
  2. Step 2: Convert to fraction form
    21,831.16/30,125.70 = 12,879/x
  3. Step 3: Cross multiply
    21,831.16x = 30,125.70 × 12,879
  4. Step 4: Simplify right side
    21,831.16x = 387,988,890.30
  5. Step 5: Solve for x
    x = 387,988,890.30/21,831.16
  6. Step 6: Final answer
    x = 17,772.25

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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.