Home / 21,003.11-28,974.81-13,831.12

Finding the Fourth Proportional to 21,003.11, 28,974.81 and 13,831.12

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Solution

The fourth proportional to 21,003.11, 28,974.81 and 13,831.12 is: 19,080.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,003.11 : 28,974.81 = 13,831.12 : x
  2. Step 2: Convert to fraction form
    21,003.11/28,974.81 = 13,831.12/x
  3. Step 3: Cross multiply
    21,003.11x = 28,974.81 × 13,831.12
  4. Step 4: Simplify right side
    21,003.11x = 400,754,162.17
  5. Step 5: Solve for x
    x = 400,754,162.17/21,003.11
  6. Step 6: Final answer
    x = 19,080.70

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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.