Home / 21,018.87-31,507.04-13,628.03

Finding the Fourth Proportional to 21,018.87, 31,507.04 and 13,628.03

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Solution

The fourth proportional to 21,018.87, 31,507.04 and 13,628.03 is: 20,428.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,018.87 : 31,507.04 = 13,628.03 : x
  2. Step 2: Convert to fraction form
    21,018.87/31,507.04 = 13,628.03/x
  3. Step 3: Cross multiply
    21,018.87x = 31,507.04 × 13,628.03
  4. Step 4: Simplify right side
    21,018.87x = 429,378,660.66
  5. Step 5: Solve for x
    x = 429,378,660.66/21,018.87
  6. Step 6: Final answer
    x = 20,428.25

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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.