Home / 21,003.12-28,957.68-13,831.92

Finding the Fourth Proportional to 21,003.12, 28,957.68 and 13,831.92

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Solution

The fourth proportional to 21,003.12, 28,957.68 and 13,831.92 is: 19,070.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,003.12 : 28,957.68 = 13,831.92 : x
  2. Step 2: Convert to fraction form
    21,003.12/28,957.68 = 13,831.92/x
  3. Step 3: Cross multiply
    21,003.12x = 28,957.68 × 13,831.92
  4. Step 4: Simplify right side
    21,003.12x = 400,540,313.15
  5. Step 5: Solve for x
    x = 400,540,313.15/21,003.12
  6. Step 6: Final answer
    x = 19,070.51

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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.