Home / 20,933-28,887.36-11,372.78

Finding the Fourth Proportional to 20,933, 28,887.36 and 11,372.78

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Solution

The fourth proportional to 20,933, 28,887.36 and 11,372.78 is: 15,694.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,933 : 28,887.36 = 11,372.78 : x
  2. Step 2: Convert to fraction form
    20,933/28,887.36 = 11,372.78/x
  3. Step 3: Cross multiply
    20,933x = 28,887.36 × 11,372.78
  4. Step 4: Simplify right side
    20,933x = 328,529,590.06
  5. Step 5: Solve for x
    x = 328,529,590.06/20,933
  6. Step 6: Final answer
    x = 15,694.34

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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.