Home / 21,420.72-29,561.76-11,991.24

Finding the Fourth Proportional to 21,420.72, 29,561.76 and 11,991.24

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Solution

The fourth proportional to 21,420.72, 29,561.76 and 11,991.24 is: 16,548.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,420.72 : 29,561.76 = 11,991.24 : x
  2. Step 2: Convert to fraction form
    21,420.72/29,561.76 = 11,991.24/x
  3. Step 3: Cross multiply
    21,420.72x = 29,561.76 × 11,991.24
  4. Step 4: Simplify right side
    21,420.72x = 354,482,158.98
  5. Step 5: Solve for x
    x = 354,482,158.98/21,420.72
  6. Step 6: Final answer
    x = 16,548.56

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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.