Home / 21,761.81-30,029.03-12,808.78

Finding the Fourth Proportional to 21,761.81, 30,029.03 and 12,808.78

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Solution

The fourth proportional to 21,761.81, 30,029.03 and 12,808.78 is: 17,674.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,761.81 : 30,029.03 = 12,808.78 : x
  2. Step 2: Convert to fraction form
    21,761.81/30,029.03 = 12,808.78/x
  3. Step 3: Cross multiply
    21,761.81x = 30,029.03 × 12,808.78
  4. Step 4: Simplify right side
    21,761.81x = 384,635,147.80
  5. Step 5: Solve for x
    x = 384,635,147.80/21,761.81
  6. Step 6: Final answer
    x = 17,674.78

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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.