Home / 21,578.55-29,779.11-11,887.56

Finding the Fourth Proportional to 21,578.55, 29,779.11 and 11,887.56

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Solution

The fourth proportional to 21,578.55, 29,779.11 and 11,887.56 is: 16,405.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,578.55 : 29,779.11 = 11,887.56 : x
  2. Step 2: Convert to fraction form
    21,578.55/29,779.11 = 11,887.56/x
  3. Step 3: Cross multiply
    21,578.55x = 29,779.11 × 11,887.56
  4. Step 4: Simplify right side
    21,578.55x = 354,000,956.87
  5. Step 5: Solve for x
    x = 354,000,956.87/21,578.55
  6. Step 6: Final answer
    x = 16,405.22

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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.