Home / 21,003.51-28,974.63-13,443.78

Finding the Fourth Proportional to 21,003.51, 28,974.63 and 13,443.78

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Solution

The fourth proportional to 21,003.51, 28,974.63 and 13,443.78 is: 18,545.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,003.51 : 28,974.63 = 13,443.78 : x
  2. Step 2: Convert to fraction form
    21,003.51/28,974.63 = 13,443.78/x
  3. Step 3: Cross multiply
    21,003.51x = 28,974.63 × 13,443.78
  4. Step 4: Simplify right side
    21,003.51x = 389,528,551.30
  5. Step 5: Solve for x
    x = 389,528,551.30/21,003.51
  6. Step 6: Final answer
    x = 18,545.88

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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.