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Finding the Fourth Proportional to 21,685.82, 29,811.41 and 18,649.80

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Solution

The fourth proportional to 21,685.82, 29,811.41 and 18,649.80 is: 25,637.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,685.82 : 29,811.41 = 18,649.80 : x
  2. Step 2: Convert to fraction form
    21,685.82/29,811.41 = 18,649.80/x
  3. Step 3: Cross multiply
    21,685.82x = 29,811.41 × 18,649.80
  4. Step 4: Simplify right side
    21,685.82x = 555,976,740.97
  5. Step 5: Solve for x
    x = 555,976,740.97/21,685.82
  6. Step 6: Final answer
    x = 25,637.81

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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.