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Finding the Fourth Proportional to 21,653.86, 29,879.12 and 13,151.56

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Solution

The fourth proportional to 21,653.86, 29,879.12 and 13,151.56 is: 18,147.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,653.86 : 29,879.12 = 13,151.56 : x
  2. Step 2: Convert to fraction form
    21,653.86/29,879.12 = 13,151.56/x
  3. Step 3: Cross multiply
    21,653.86x = 29,879.12 × 13,151.56
  4. Step 4: Simplify right side
    21,653.86x = 392,957,039.43
  5. Step 5: Solve for x
    x = 392,957,039.43/21,653.86
  6. Step 6: Final answer
    x = 18,147.21

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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.