Home / 21,242.88-29,102.40-20,453.76

Finding the Fourth Proportional to 21,242.88, 29,102.40 and 20,453.76

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Solution

The fourth proportional to 21,242.88, 29,102.40 and 20,453.76 is: 28,021.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,242.88 : 29,102.40 = 20,453.76 : x
  2. Step 2: Convert to fraction form
    21,242.88/29,102.40 = 20,453.76/x
  3. Step 3: Cross multiply
    21,242.88x = 29,102.40 × 20,453.76
  4. Step 4: Simplify right side
    21,242.88x = 595,253,505.02
  5. Step 5: Solve for x
    x = 595,253,505.02/21,242.88
  6. Step 6: Final answer
    x = 28,021.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.