Home / 21,011.80-28,996.11-11,580.37

Finding the Fourth Proportional to 21,011.80, 28,996.11 and 11,580.37

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Solution

The fourth proportional to 21,011.80, 28,996.11 and 11,580.37 is: 15,980.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.80 : 28,996.11 = 11,580.37 : x
  2. Step 2: Convert to fraction form
    21,011.80/28,996.11 = 11,580.37/x
  3. Step 3: Cross multiply
    21,011.80x = 28,996.11 × 11,580.37
  4. Step 4: Simplify right side
    21,011.80x = 335,785,682.36
  5. Step 5: Solve for x
    x = 335,785,682.36/21,011.80
  6. Step 6: Final answer
    x = 15,980.81

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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.