Home / 20,645.21-28,490.26-11,213.69

Finding the Fourth Proportional to 20,645.21, 28,490.26 and 11,213.69

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Solution

The fourth proportional to 20,645.21, 28,490.26 and 11,213.69 is: 15,474.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,645.21 : 28,490.26 = 11,213.69 : x
  2. Step 2: Convert to fraction form
    20,645.21/28,490.26 = 11,213.69/x
  3. Step 3: Cross multiply
    20,645.21x = 28,490.26 × 11,213.69
  4. Step 4: Simplify right side
    20,645.21x = 319,480,943.66
  5. Step 5: Solve for x
    x = 319,480,943.66/20,645.21
  6. Step 6: Final answer
    x = 15,474.82

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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.