Home / 21,151.20-29,202.32-13,600.80

Finding the Fourth Proportional to 21,151.20, 29,202.32 and 13,600.80

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Solution

The fourth proportional to 21,151.20, 29,202.32 and 13,600.80 is: 18,777.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,151.20 : 29,202.32 = 13,600.80 : x
  2. Step 2: Convert to fraction form
    21,151.20/29,202.32 = 13,600.80/x
  3. Step 3: Cross multiply
    21,151.20x = 29,202.32 × 13,600.80
  4. Step 4: Simplify right side
    21,151.20x = 397,174,913.86
  5. Step 5: Solve for x
    x = 397,174,913.86/21,151.20
  6. Step 6: Final answer
    x = 18,777.89

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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.