Home / 21,579.12-29,777.94-13,908.78

Finding the Fourth Proportional to 21,579.12, 29,777.94 and 13,908.78

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Solution

The fourth proportional to 21,579.12, 29,777.94 and 13,908.78 is: 19,193.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,579.12 : 29,777.94 = 13,908.78 : x
  2. Step 2: Convert to fraction form
    21,579.12/29,777.94 = 13,908.78/x
  3. Step 3: Cross multiply
    21,579.12x = 29,777.94 × 13,908.78
  4. Step 4: Simplify right side
    21,579.12x = 414,174,816.31
  5. Step 5: Solve for x
    x = 414,174,816.31/21,579.12
  6. Step 6: Final answer
    x = 19,193.31

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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.